Intel Computer Hardware 05 2065 003 User Manual

IP Media Server (Global Call)  
Demo Guide  
August 2005  
05-2065-003  
 
Contents  
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
IP Media Server (Global Call) Demo Guide – August 2005  
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Contents  
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IP Media Server (Global Call) Demo Guide – August 2005  
 
Revision History  
This revision history summarizes the changes made in each published version of this document.  
Document No.  
Publication Date  
Description of Revisions  
05-2065-003  
August 2005  
Globally added Linux-specific filenames, paths, and commands.  
Globally updated paths to use environment variables for installation base directory.  
Demo Description chapter: Added note about channel density and numbering  
restrictions  
Editing the IPMediaServer.cfg Configuration File section: Updated descriptions of  
QoS attributes to match IPML API Reference. Updated sample config file.  
Using the Media Server section: Added CSP Barge-in to Main Menu listing.  
Corrected description of CSP Prompt.  
Demo Voice Menu Flowchart figure: Corrected description of CSP Prompt.  
05-2065-002  
05-2065-001  
November 2003  
September 2003  
Removed all references to fax, which is not supported in System Release version of  
demo.  
Initial version of document.  
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Revision History  
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IP Media Server (Global Call) Demo Guide — August 2005  
 
About This Publication  
This section describes the purpose of the guide, the intended audience, and provides references to  
other documents that may be useful to the user.  
Purpose  
This guide provides information on the IP Media Server (Global Call) demo that is provided with  
®
®
Intel Dialogic System Release 6.1. The guide describes the demo, its requirements, and provides  
details on how it works.  
Intended Audience  
This guide is intended for application developers who will be developing a media server  
application using the Global Call API. Developers should be familiar with the C++ programming  
language and either the Windows* or Linux* programming environment.  
This information is intended for:  
Distributors  
Toolkit Developers  
Independent Software Vendors (ISVs)  
Value Added Resellers (VARs)  
Original Equipment Manufacturers (OEMs)  
How to Use This Publication  
Refer to this publication after you have installed the hardware and the system software.  
This publication assumes that you are familiar with the Windows or Linux operating system and  
the C++ programming language.  
The information in this guide is organized as follows:  
Chapter 1, “Demo Description” introduces you to the demo and its features  
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About This Publication  
Chapter 2, “System Requirements” outlines the hardware and software required to run the  
demo  
Chapter 3, “Preparing to Run the Demo” describes the preparations required before running  
the demo  
Chapter 4, “Running the Demo” describes how to run the demo  
Chapter 5, “Demo Details” provides details on how the demo works  
Related Information  
See the following for more information:  
the Release Guide for your Intel Dialogic System Release  
®
the Configuration Guide for your Intel NetStructure DM/IP series or IPT series board  
Global Call IP Technology Guide  
Voice API Programming Guide  
Voice API Library Reference  
Standard Runtime Library API Programming Guide  
Standard Runtime Library API Library Reference  
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1
1
Demo Description  
.
This chapter describes the basic features of the IP Media Server (Global Call) demo.  
The IP Media Server (Global Call) demo is an object-oriented host-based application that  
demonstrates using the Global Call API to build an IP media server, providing voice and fax  
services via IP technology. The demo source code can be used as sample code for those who want  
to begin developing an application from a working application.  
Note: The IP Media Server (Global Call) demo is limited to a maximum of four simultaneous channels.  
Additionally, the channel numbers used must be below 120; the demo will fail to run if you attempt  
to use a channel number higher than 120.  
The IP Media Server (Global Call) demo supports the following features:  
Voice service  
CSP barge in  
Configuration file  
Command line options  
Note: The IP Media Server (Global Call) demo does not function as a gateway. Therefore, it can only  
answer calls from the IP network. Gateway functionality can be added by writing additional  
software code within the IP module that will allow it to make outgoing calls to the IP network, and  
connecting a gateway to interface with the PSTN.  
The IP Media Server (Global Call) demo is a cross-OS demo, designed to run under both the  
Windows and Linux environments. Most of the differences in the environments are handled  
directly by the programming interface and are transparent to the user. Other differences, due to  
inherent differences in the operating systems, are handled by the Platform Dependency Library  
(PDL). For more information about the PDL refer to the source code in the pdl_win or pdl_linux  
directories directory.  
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Demo Description  
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2
2
S
.
ystem Requirements  
This chapter discusses the system requirements for running the IP Media Server (Global Call)  
demo. It contains the following topics:  
2.1  
Hardware Requirements  
To run the IP Media Server (Global Call) demo, you need:  
One of the following:  
®
Intel NetStructure DM/IP Series board  
®
Intel NetStructure IPT Series board  
®
also requires an Intel NetStructure DM/V-A series board for PSTN connection  
IP network cable  
For other hardware requirements, such as memory requirements, see the Release Guide for the  
system release you are using.  
2.2  
Software Requirements  
®
To run the IP Media Server (Global Call) demo as documented in this guide, you need the Intel  
®
Dialogic System Software 6.1 or later. For a list of operating system requirements see the Release  
Guide for the system release you are using.  
See Section 3.2, “Compiling and Linking”, on page 18 for a list of compilers that may be used with  
this demo. Using a non-supported compiler may cause unforeseen problems in running the demo.  
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System Requirements  
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3
3
Preparing to Run the Demo  
.
This chapter discusses the preparations necessary to run the IP Media Server (Global Call) demo. It  
provides information about the following topics:  
3.1  
Editing Configuration Files  
This section discusses how to configure the demo for your system. It contains the following topics:  
3.1.1  
Configuration File Location  
Before running the IP Media Server (Global Call) demo, modify the IPMediaServer.cfg file to  
reflect your system environment. Use a text editor and open the file from the following location:  
Windows  
$(INTEL_DIALOGIC_DIR)\Demos\IPMediaServer\Release  
Linux  
$(INTEL_DIALOGIC_DIR)/demos/IPMediaServer/Release  
where $(INTEL_DIALOGIC_DIR) identifies the base installation directory for the software.  
3.1.2  
Editing the IPMediaServer.cfg Configuration File  
Below is an example of the IPMediaServer.cfg file. Update the following information:  
ipProtocolName  
The IP protocol for opening IP line devices. Possible vlues are:  
H323  
SIP  
both  
DTMFmode  
Specifies how DTMF tones are transmitted. Possible values are:  
OutofBand – usually used with low bandwith coders, such as GSM  
Note: OutofBand is used for H.323 only.  
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Preparing to Run the Demo  
InBand – usually used with G.711 coders  
RFC2833  
Capability  
Describes the transmit and receive coders. See the Global Call IP Technology Guide for  
specific information about coder support. The parameters are as follows:  
TxType – the transmit voice coder  
TxFramesPerPkt – the number of frames per packet for the selected Tx coder  
TxVAD – specifies if VAD is active for the selected Tx coder  
RxType – the receive voice coder  
RxFramesPerPkt – the number of frames per packet for the selected Rx coder  
Note: The G.711 coder defines frames per packet using the packet size in milliseconds, i.e.  
10, 20, or 30 milliseconds. Refer to the Sample Configuration File, below, for the  
correct syntax for all the parameters.  
RxVAD – specifies if VAD is active for the selected Rx coder  
Quality of Service  
The application can set threshold values to monitor the quality of service during calls. A fault  
occurs when the result of a measurement of a QoS parameter crosses a predefined threshold. A  
success occurs when the result of a measurement of a QoS parameter dis not cross a predefined  
threshold. The QoS parameters are measured during time intervals, starting when a call is  
established. The following parameters are supported:  
MediaAlarmLostPackets – monitors the number of lost IP packets during a call  
(supported for IPT series boards only)  
MediaAlarmJitter – monitors the jitter (as defined in RFC 1889) during IP transmission  
QoS Attributes  
The threshold for each QoS parameter is measured with the following six attributes:  
Threshold – defines when a QoS parameter is in a fault condition. A fault occurs when the  
result of a measurement of a QoS parameter crossed the Threshold value.  
DebounceOn – the time during which faults are measured (in msec., must be multiple of  
Interval)  
DebounceOff – the time during which successes are measured (in msec., must be multiple  
of Interval)  
Interval – the amount of time between two QoS parameter measurements (in multiples of  
100 msec)  
Percent_Fail – used to detect failure condition, together with DebounceOn (expressed as  
a percentage of failures)  
Percent_Success – used to detect failure recovery, together with DebounceOff (expressed  
as a percentage of successes)  
The default values are as follows:  
Table 1. Quality of Service Parameter Defaults for DM/IP Series Boards  
Time  
Interval (ms)  
Debounce Debounce %Success  
% Fail  
Threshold  
QoS Type  
Jitter  
Fault Threshold  
On (ms)  
Off (ms)  
Threshold  
60 (ms)  
5000  
20000  
60000  
40  
40  
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Preparing to Run the Demo  
Table 2. Quality of Service Parameter Defaults for IPT Series Boards  
Fault  
Time  
Interval (ms)  
Debounce Debounce %Success  
% Fail  
Threshold  
QoS Type  
Jitter  
Threshold 1  
On (ms)  
Off (ms)  
Threshold  
30 (ms)  
100 (%)  
0 (n/a)  
0 (n/a)  
0 (n/a)  
0 (n/a)  
0 (n/a)  
0 (n/a)  
0 (n/a)  
Lost Packets  
0 (n/a)  
0 (n/a)  
0 (n/a)  
Notes:  
1. Units for Fault Threshold are different for different QoS Types. See unit indications in table cells.  
Sample Configuration File  
################################################################################################  
# IP Protocol :  
#
#
The IP Protocol used for opening the IP Line devices, values: H323, SIP, both  
# DTMFmode  
#
#
#
possible options:  
OutOfBand, inband, rfc2833  
# Capability posiblities:  
#
#
#
#
#
#
#
#
#
#
#
#
#
#
g711Alaw  
g711Mulaw  
gsm  
gsmEFR  
g723_5_3k  
g723_6_3k  
g729a  
g729ab  
t38UDPFax  
Note: if you want to run the demo with coder g729 use:  
g729a for running with VAD disable  
and 729ab for running with VAD enable  
# Caution:  
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
If capability is g711Alaw /Mulaw ==> FramesPerPkt = 10,20,30.  
G711 frame per packet defines the packet size in  
milliseconds  
If capability is g723_5_3k / 6_3k ==> FramesPerPkt = 1, 2, 3 .  
FrameSize isn't needed, default= 30ms.  
==> FramesPerPkt = 1, 2, 3 .  
FrameSize isn't needed, default= 20ms.  
==> FramesPerPkt = 1, 2, 3 .  
FrameSize isn't needed, default= 20ms.  
==> FramesPerPkt = 3, 4 .  
If capability is gsm  
If capability is gsmEFR  
If capability is g729a  
FrameSize isn't needed, default= 10ms.  
VAD disable, the VAD parameter is ignored  
==>FramesPerPkt = 3, 4 .  
If capability is g729ab  
FrameSize isn't needed, default= 10ms.  
VAD enable, the VAD parameter is ignored  
################################################################################################  
ipProtocolName = H323  
DTMFmode = inBand  
Channel = 1-120  
{
Capability  
{
#
#
TxType = g711Alaw  
TxFramesPerPkt = 30  
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Preparing to Run the Demo  
#
#
#
#
TxVAD = 0  
RxType = g711Alaw  
RxFramesPerPkt = 30  
RxVAD = 0  
TxType = g711Mulaw  
TxFramesPerPkt = 20  
TxVAD = 0  
RxType = g711Mulaw  
RxFramesPerPkt = 20  
RxVAD = 0  
#
TxType = t38UDPFax  
}
MediaAlarmLostPackets  
{
Threshold  
DebounceOn  
DebounceOff  
Interval  
= 20  
# Threshold value  
= 10000 # Threshold debounce ON  
= 10000 # Threshold debounce OFF  
= 1000 # Threshold Time Interval (ms)  
PercentSuccess = 60  
# Threshold Success Percent  
# Threshold Fail Percent  
PercentFail  
= 40  
}
MediaAlarmJitter  
{
Threshold  
DebounceOn  
DebounceOff  
Interval  
= 60  
# Threshold value  
= 20000 # Threshold debounce ON  
= 60000 # Threshold debounce OFF  
= 5000 # Threshold Time Interval (ms)  
PercentSuccess = 60  
# Threshold Success Percent  
# Threshold Fail Percent  
PercentFail  
}
= 40  
# MediaAlarmResetAlarmState  
}
= 0  
3.2  
Compiling and Linking  
Compile the IP Media Server (Global Call) demo project within one of the following environments:  
Windows  
To compile the IP Media Server (Global Call) demo on a Windows system, use Microsoft* Visual  
Studio* 6.0 with Service Pack 5.  
Set IPMediaServer as the active project and build.  
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Preparing to Run the Demo  
Linux  
To compile the IP Media Server (Global Call) demo on a Linux system, use gcc version 3.2.3.  
To compile the entire project, go to the directory  
$(INTEL_DIALOGIC_DIR)/demos/IPMediaServer and issue the commands:  
make clean  
make  
To compile an individual module, go to the specific module directory (for example,  
$(INTEL_DIALOGIC_DIR)/demos/IPMediaServer/Modules/FaxModule for the fax module), and  
issue the commands:  
make clean  
make  
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Preparing to Run the Demo  
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IP Media Server (Global Call) Demo Guide — August 2005  
 
4
4
R
.
unning the Demo  
This chapter discusses how to run the IP Media Server (Global Call) demo. It contains the  
following topics:  
4.1  
Starting the Demo  
The demo executable file for the IP Media Server (Global Call) demo can be started as follows:  
Windows  
From a command prompt window, change to the directory:  
$(INTEL_DIALOGIC_DIR)\Demos\IPMediaServer\Release  
Type IPMediaServerto run the IP Media Server (Global Call) demo using the default settings.  
Linux  
Change to the directory:  
$(INTEL_DIALOGIC_DIR)/demos/IPMediaServer/Release  
Type IPMediaServerto run the IP Media Server (Global Call) demo using the default settings.  
4.2  
Demo Options  
To specify certain options at run-time, launch the demo from a command line, using any of the  
switches listed in Table 3.  
Table 3. Command Line Switches  
Switch  
-c<filename>  
-e<encoding type> Sets the encoding type:  
Action  
Default  
-cIPMediaServer.cfg  
-em  
Configuration file name  
m – mu-law  
a – A-law  
-h or ?  
Prints the command syntax to the screen  
Off  
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Running the Demo  
Table 3. Command Line Switches (Continued)  
-n<n>  
Sets the number of channels  
Activates Quality of Service  
The lesser of Voice Devices  
or IP devices  
-q  
Disabled  
Example  
The following example shows how to launch the demo from a command line with options:  
IPMediaServer -n64 -cmyconfig.cfg -ea  
This command launches the demo with 64 channels, using the myconfig.cfg configuration file and  
A-law encoding.  
4.3  
Using the Demo  
This section describes how to use the IP Media Server (Global Call) demo and contains the  
following topics:  
4.3.1  
Keyboard Commands  
The demo always waits for input from the keyboard. While the demo is running, you may enter any  
of the commands listed in Table 4.  
Table 4. Runtime Keyboard Commands  
Command  
Function  
q or Q or Ctrl+c  
Terminates the application  
4.3.2  
Using the Media Server  
The IP Media Server (Global Call) demo allows the caller to interact with a series of voice menus,  
using the telephone keypad to enter an option. Basic operations include playing a pre-recorded  
message, recording a new message, and barge-in for CSP. Each menu prompts the caller to select  
an action by pushing a key. The call state within which the menu is called is indicated by the square  
brackets. Figure 1 shows the voice prompt flow, grouping the prompts by feature (voice, CSP).  
Main Menu [Main_Menu]  
1 - Voice Mail  
3 - Conferencing (not supported in HMP 1.x)  
4 - CSP Barge-in  
* - Quit  
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Running the Demo  
Voice Mail Menu [Voicemail_Menu]  
1 - Record Message  
2 - Listen to message from a mailbox  
* - Quit  
Send Message Prompt [SendMsg_Menu]  
Enter Mailbox Number - between 101 - 299  
* - Quit  
Start Record Prompt [Record_Menu]  
2 - Start Record  
Press 2 at end of message to stop recording (at end, Stop Record Prompt is played)  
* - Quit  
Stop Record Prompt [StopRec_Menu]  
2 - Discard Message and re-record message to same mailbox  
3 - Confirm Message [Save_Confirm]  
4 - Listen to Message (and replay Stop Record Prompt)  
* - Quit without saving  
Confirm Message Saved [StopRec_Menu]  
1 - Record a message  
2 - Listen to a message from a mailbox  
* - Quit  
Listen to Message Prompt [ListenMsg_Menu]  
Enter Mailbox Number - between 101 - 299 (Recorded message is played)  
* - Quit  
Stop Listen Prompt [Listening]  
2 - Discard message and quit  
* - Save message and quit  
CSP Prompt [CSP_Menu]  
Say something to barge in (new file will be created with barged-in message) or press any DTMF.  
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Running the Demo  
Figure 1. Demo Voice Menu Flowchart  
Main Menu  
Select one of the following:  
1 - Voice Mail  
4 - CSP  
* - Quit  
4
1
2
-
Fax  
Voice Mail Prompt  
1 - Record Message  
2 - Listen to message  
from a mailbox  
CSP Prompt  
Say something to barge in  
* - Quit  
* - Quit  
2
1
Listen Message  
Prompt  
Enter Mailbox  
Number (Message  
is played)  
Send Message  
Prompt  
Enter Mailbox  
Number  
* - Quit  
* - Quit  
Mailbox  
number  
Mailbox  
number  
Stop Listen Prompt  
2 - Discard message  
and quit  
* - Save message and  
quit  
Start Record Prompt  
2 - Start/Stop Record  
* - Quit  
2
2
Stop Record Prompt  
2 - Discard message and  
re-record message to  
same mailbox  
3 - Confirm message  
4 - Replay message  
* - Quit  
3
4
Confirm Message Saved  
Prompt  
Confirm message  
Replay Message  
Replay Stop Record  
Prompt  
Return to Voice Mail prompt  
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Running the Demo  
4.4  
Stopping the Demo  
The IP Media Server (Global Call) demo runs until it is terminated. Press “q” or “Q” to terminate  
the demo application.  
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Running the Demo  
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5
5
Demo Details  
.
This chapter discusses the IP Media Server (Global Call) demo in more detail. It contains the  
following topics:  
5.1  
Files Used by the Demo  
This section lists the files used by the IP Media Server (Global Call) demo. It contains the  
following information  
5.1.1  
Demo Source Code Files  
In Windows, the IP Media Server (Global Call) demo files listed in Table 5 are located within:  
$(INTEL_DIALOGIC_DIR)\Demos\IPMediaServer  
In Linux, the IP Media Server (Global Call) demo files listed in Table 5 are located within:  
$(INTEL_DIALOGIC_DIR)/demos/IPMediaServer  
Table 5. Files in IPMediaServer Folder Used by the IP Media Server (Global Call) Demo  
Sub-Directory (if any)  
File Name  
CConfig.cpp  
Purpose  
Implements the operations of the Configuration  
class  
CConfig.h  
Function prototype for config.cpp  
CEventRouter.cpp  
CEventRouter.h  
IPMediaServer.dsp  
IPMediaServer.dsw  
main.cpp  
Implements the operations of the EventRouter class  
Function prototype for ceventrouter.cpp  
Visual C++ project file  
Visual C++ project workspace  
Contains the main function and the WaitForKey  
Function prototype for main.cpp  
main.h  
makefile  
Top-level make file (Linux only)  
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Demo Details  
Table 5. Files in IPMediaServer Folder Used by the IP Media Server (Global Call) Demo  
Sub-Directory (if any)  
Release  
File Name  
unavConf.vox  
Purpose  
Voice file  
Voice file  
Voice file  
Release  
cspPrompt.vox  
errorInput.vox  
IPMediaServer.cfg  
IPMediaServer.exe  
listenMenu.vox  
mainMenu.vox  
savecCnfirm.vox  
sendfaxMenu.vox  
sendMsg.vox  
Release  
Release  
Demo configuration file  
Demo executable  
Voice file  
Release  
Release  
Release  
Voice file  
Release  
Voice file  
Release  
Voice file  
Release  
Voice file  
Release  
startRec.vox  
Voice file  
Release  
stopListen.vox  
stopRec.vox  
Voice file  
Release  
Voice file  
Release  
thankYou.vox  
Voice file  
Release  
unavCsp.vox  
Voice file  
Release  
unavFax.vox  
Voice file  
Release  
unavMenu.vox  
voicemailMenu.vox  
Voice file  
Release  
Voice file  
In Windows, the IP Media Server (Global Call) demo files listed in Table 6 are located within:  
$(INTEL_DIALOGIC_DIR)\Demos\IPMediaServer\Modules  
In Linux, the IP Media Server (Global Call) demo files listed in Table 6 are located within:  
$(INTEL_DIALOGIC_DIR)/demos/IPMediaServer/Modules  
Table 6. Files in Modules Folder Used by the IP Media Server (Global Call) Demo  
Sub-Directory  
common  
File Name  
Defines.h  
Purpose  
Definitions and structures for the demo  
Interfaces used in the demo  
common  
common  
common  
IPModule  
IPModule  
IPModule  
IPModule  
IPModule  
IPModule  
Interfaces.h  
Parameters.h  
makefile  
Parameters used in the demo  
Module make file (Linux only)  
CIPDevice.cpp  
CIPDevice.h  
CIPMBoard.cpp  
CIPMBoard.h  
CIPModule.cpp  
CIPModule.h  
Implements the operations of the CIPDevice class  
Function prototype for cipdevice.cpp  
Implements the operations of the CIPMBoard class  
Function prototype for cipmboard.cpp  
Implements the operations of the CIPModule class  
Function prototype for cipmodule.cpp  
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Demo Details  
Table 6. Files in Modules Folder Used by the IP Media Server (Global Call) Demo (Continued)  
Sub-Directory  
IPModule  
File Name  
Purpose  
CIPStateMachine.cpp  
Implements the operations of the CIPStateMachine  
class  
IPModule  
IPModule  
IPModule  
IPModule  
CIPStateMachine.h  
CIPTBoard.cpp  
CIPTBoard.h  
Function prototype for cipstatemachine.cpp  
Implements the operations of the CIPTBoard class  
Function prototype for ciptboard.cpp  
CMediaAlarms.cpp  
Implements the operations of the CMediaAlarms  
class  
IPModule  
IPModule  
IPModule  
CMediaAlarms.h  
IPModule.dsp  
makefile  
Function prototype for cmediaalarms.cpp  
Visual C++ project file  
Module-level make file (Linux only)  
Compiled IP Module library  
IPModule\Release or  
IPModule/Release  
IPModule.lib  
VoiceModule  
VoiceModule  
VoiceModule  
VoiceModule  
VoiceModule  
VoiceModule  
VoiceModule  
CCSPDevice.cpp  
CCSPDevice.h  
CMailBoxBtil.cpp  
CMailBoxUtil.h  
Implements the operations of the CCSPDevice class  
Function prototype for ccdspdevice.cpp  
Implements the operations of the CMailBoxUtil class  
Function prototype for cmailboxutil.cpp  
CVoiceBoard.cpp  
CVoiceBoard.h  
CVoiceDevice.cpp  
Implements the operations of the voiceBoard class  
Function prototype for cvoiceboard.cpp  
Implements the operations of the CVoiceDevice  
class  
VoiceModule  
VoiceModule  
CVoiceDevice.h  
Function prototype for cvoicedevice.cpp  
CVoiceModule.cpp  
Implements the operations of the CVoiceModule  
class  
VoiceModule  
VoiceModule  
CVoiceModule.h  
Function prototype for cvoicemodule.cpp  
CVoiceStateMachine.cpp Implements the operations of the  
CVoiceStateMachine class  
VoiceModule  
VoiceModule  
VoiceModule  
CVoiceStateMachine.h  
VoiceModule.dsp  
makefile  
Function prototype for cvoicestatemachine.cpp  
Visual C++ project file  
Module-level make file (Linux only)  
Compiled Voice Module library  
VoiceModule\Release or  
VoiceModule/Release  
VoiceModule.lib  
5.1.2  
PDL Files  
In Windows, the PDL files listed in Table 7 are located within the directory:  
$(INTEL_DIALOGIC_DIR)\Demos\Shared\pdl_win  
In Linux, the PDL files listed in Table 7 are located within the directory:  
$(INTEL_DIALOGIC_DIR)/demos/Shared/pdl_Linux  
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Demo Details  
Table 7. PDL Files Used by the IP Media Server (Global Call) Demo  
Sub-Directory (if any)  
File Name  
iptransport.cpp  
iptransport.h  
pdl.c  
Purpose  
PDL IP transport functions  
Function prototype for iptransport.cpp  
Platform dependency functions  
Function prototype for pdl.c  
PDL version information  
pdl.h  
pdl.ver  
pdl_win.dsp  
pdl_win.dsw  
makefile  
PDL Visual C project file  
PDL Visual C project workspace  
PDL make file (Linux only)  
Compiled PDL library  
release  
psl_win.lib  
5.2  
Programming Model  
This section describes the IP Media Server (Global Call) demo architecture in the following topics:  
5.2.1  
Module Structure  
The IP Media Server (Global Call) demo uses a modular architecture, in which each technology  
(IP, voice, CSP) is wrapped inside a module so that a particular technology can be easily added or  
removed.  
The system contains two modules:  
IP module that serves as the front end to communicate with the IP network  
Voice module to provide voice service  
The system also contains a software component, the EventRouter, to connect the modules. The  
basic architecture of the system is illustrated in Figure 2.  
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Demo Details  
Figure 2. IP Media Server (Global Call) Demo Architecture  
Voice Module  
Board  
Device  
State Machine  
IP Module  
Board  
Device  
EventRouter  
State Machine  
User Module  
Board  
Device  
State Machine  
Each module is composed of four elements:  
Board  
Device  
State Machine (call control)  
Wrapper  
The Wrapper acts like a manager, receiving requests from the EventRouter and distributing the  
request to the boards or devices. A device can have one or multiple state machines attached to it.  
Each state machine represents one call.  
5.2.2  
EventRouter  
The EventRouter is responsible for communicating with the modules. It does the following:  
Maintains routing tables  
Retrieves event data from the SRL and routes it to a module for processing  
Forwards event process result to another module if so requested.  
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Demo Details  
Figure 3. EventRouter  
Retrieve event  
data from GC  
library  
Forward result to destination  
For which  
technology?  
I P  
Voice  
Voice Module  
IP Module  
Yes  
result  
result  
No  
result.destination  
= NONE ?  
5.2.3  
Interfaces  
The modular architecture implements a unified interface that allows replacement of modules by  
including new header files and adjusting routing statements.  
A module is treated by the EventRouter as a block box. It has three types of APIs:  
Initialization  
Init( ) – for initializing a module  
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Demo Details  
GetNumOfDevices( ) – returns the number of devices available to the application  
GetDeviceHandle( ) – returns a device handle  
GetDeviceXmitSlot( ) – returns a device transmit timeslot  
SetDeviceReceiveSlot( ) – sets a device receive timeslot  
Runtime  
ProcessEvent( ) – processes event data  
Termination  
Exit( ) – exits a module  
5.2.4  
Classes  
This section describes the classes contained in the demo and within each module. Each module  
contains three classes: board, device, and state machine.  
Table 8. Application Classes  
Class Name  
Interface  
CConfig  
ParseConfigFile( )  
• Responsible for parsing configuration file and  
populating configuration variables in the program.  
• Parses configuration file  
ChannelNumber( )  
• Gets the number of channels that are the  
minimum of the number of voice lines and the  
number of IP lines  
IPParms( )  
• Returns configured IP parameters  
VoiceParms( )  
• Returns configured voice parameters  
CEventRouter  
Init( )  
• Initializes the IP module and voice module  
• Builds event routing tables  
Responsible for connecting all the modules. It does  
the following:  
• Maintains routing tables  
• Retrieves event data from the SRL and routes  
them to modules  
Exit( )  
Terminates the voice module and IP module  
• Gets event process results from the modules and  
routes them to other modules if the destination is  
not NONE  
ProcessEvent( )  
• Retrieves event data from Global Call and routes  
them to a module for processing  
• Routes processing result to other module(s) for  
further processing.  
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Demo Details  
Table 9. IP Module Classes  
Category  
Module  
Class Name  
Interface  
CIPModule  
Init( )  
• Interacts with CIPBoard and CIPDevice.  
• Exports IP module functions to  
CEventRouter.  
• Starts host based IP protocol  
• Creates and initializes IPT (virtual) board  
objects  
• Creates and initializes IPM (media)  
board objects  
• Creates and initializes IP device objects  
Note: The public functions in this class can  
be accessed by classes outside the  
IP module.  
Exit( )  
Terminates and closes IPT boards  
Terminates and closes IPM boards  
Terminates and closes IP devices  
ProcessEvent( )  
• Receives event data from the event  
router and distributes them, based on  
handles, to IPT boards, IPM boards or IP  
devices  
GetNumOfDevices( )  
• Returns number of IP devices engaging  
in the communication  
GetDeviceHandle( )  
• Returns an IP device handle  
GetDeviceXmitSlot( )  
• Returns the transmit timeslot of an IP  
device  
SetDeviceReceiveSlot( )  
• Sets the receiving timeslot of an IP  
device  
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Table 9. IP Module Classes (Continued)  
Category  
Board  
Class Name  
Interface  
CIPTBoard  
Init( )  
• Interacts with the Global Call library to  
handle IP virtual boards  
• Opens IPT (virtual) board and sets board  
parameters  
Note: The public function in this class  
should only be accessed by classes  
inside the IP module.  
Exit( )  
• Closes IPT (virtual) board  
ProcessEvent( )  
• Processes IPT (virtual) board events  
GetNumOfDevicesOnBoard( )  
• Returns the number of IPT devices  
(signaling devices) on the board  
CIPMBoard  
Init( )  
• Interacts with the Global Call library to  
handle IP media boards  
• Opens IP media boards  
Exit( )  
Note: The public functions in this class  
should only be accessed by classes  
inside the IP module.  
• Closes IP media boards  
ProcessEvent( )  
• Processes IP media board events  
GetNumOfDevices( )  
• Returns number of IPM devices on the  
board  
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Demo Details  
Table 9. IP Module Classes (Continued)  
Category  
Device  
Class Name  
Interface  
CIPDevice  
Init( )  
• Handles IP device operations, such as  
making/dropping calls, sending H.323  
messages, making timeslot connections,  
etc.  
• Opens an IP device. If successful,  
creates an IP state machine. If QoS is  
enabled, creates a media alarm object.  
Exit( )  
• Holds CIPStateMachine (or call control)  
• Deletes IP state machine  
• Deletes media alarm object  
• Closes IP devices  
Note: The public functions in this class  
should only be accessed by classes  
inside the IP module.  
ProcessEvent( )  
• Processes IP device events  
Connect( )  
• Allows IP device to listen to its receiving  
timeslot  
Disconnect( )  
• Allows IP device to unlisten to its  
receiving timeslot  
GetDeviceHandle( )  
• Returns IP device handle  
GetXmitSlot( )  
• Returns IP device transmit timeslot  
SetDeviceReceiveSlot( )  
• Sets IP device receiving timeslot  
SetFaxHandle( )  
• Sets fax device handle associated with  
the device  
GetFaxHandle( )  
• Returns fax device handle associated  
with the device  
State  
CIPStateMachine  
Init( )  
Machine  
• Handles IP events and maintains IP  
state machine(s)  
• Initializes the IP state machine  
Exit( )  
Note: The public functions in this class  
should only be accessed by the  
classes inside the IP module.  
Terminates the IP state machine  
ProcessEvent( )  
• Processes IP call events  
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Demo Details  
Table 10. Voice Module Classes  
Category  
Class Name  
Interface  
Module  
CVoiceModule  
Init( )  
• Interacts with CVoiceBoard and  
CVoiceDevice.  
• Opens and initializes voice board objects  
• Opens and initializes voice device objects  
• Exports Voice module functions to  
CEventRouter.  
Exit( )  
Terminates and closes voice boards  
Terminates and closes voice devices  
Note: The public functions in this class can  
be accessed by classes outside the  
Voice module.  
ProcessEvent( )  
• Receives event data from the event router  
and distributes them, based on  
devicehandles, to voice boards or voice  
devices for processing  
Board  
CVoiceBoard  
Init( )  
• Interacts with the voice library to handle  
voice boards  
• Opens voice board  
Exit( )  
• Closes voice board  
Note: The public function in this class  
should only be accessed by classes  
inside the Voice module.  
ProcessEvent( )  
• Processes voice board events  
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Demo Details  
Table 10. Voice Module Classes (Continued)  
Category  
Device  
Class Name  
Interface  
CVoiceDevice  
Init( )  
• Handles voice device operations, such  
as playing, recording, tone detection,  
and tone generation  
• Opens the voice device. If successful,  
creates voice state machine.  
Exit( )  
• Holds CVoiceStateMachine  
• Deletes the voice state machine from the  
voice device  
• Closes voice device  
Note: The public functions in this class  
should only be accessed by classes  
inside the Voice module.  
ProcessEvent( )  
• Processes voice device events  
Connect( )  
• Allows IP device to listen to its receiving  
timeslot  
Play( )  
• Plays a vox file  
OnPlayComplete( )  
• Replays a vox file when it has finished  
playing  
Record( )  
• Records voice to a vox file  
GetDigits( )  
• Retrieves DTMF digits  
GetDigitCount( )  
• Returns the number of retrieved DTMF  
digits  
GetDigitString( )  
• Returns retrieved DTMF string  
Connect( )  
• Allows the voice device to listen to its  
receiving timeslot  
Disconnect( )  
• Allows voice device to unlisten to its  
receiving timeslot  
GetStoppedReason( )  
Tells why a played voice file stops  
GetDeviceHandle( )  
• Returns voice device handle  
GetXmitSlot( )  
• Returns voice device transmit timeslot  
SetReceiveSlot( )  
• Sets voice device receiving timeslot  
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Demo Details  
Table 10. Voice Module Classes (Continued)  
Category  
State  
Class Name  
CVoiceStateMachine  
• Handles voice events and maintains  
voice state machine(s)  
Interface  
Init( )  
• Opens vox files  
• Creates mailbox utility object that  
manages mailboxes  
Machine  
Note: The public functions in this class  
should only be accessed by the  
classes inside the voice module.  
Exit( )  
• Closes vox files  
• Deletes mailbox utility object that  
manages mailboxes  
ProcessEvent( )  
• Processes voice events  
Misc  
CMailBoxUtil  
InitMailBoxes( )  
• Provides utility function to manage  
mailboxes  
• Initializes mailboxes  
CheckAndConvertDigits( )  
• Checks if the extension number is in  
allowed range. If it is, converts it into an  
integer.  
Note: The public functions in this class  
should only be accessed by the  
classes inside the voice module  
GetMailBox( )  
• Checks if the mailbox is ready to be used.  
If it is, gets the mailbox.  
CreateMailBoxFileName( )  
• Creates a filename for the mailbox  
FreeMailBox( )  
• Frees the mailbox for future use  
5.3  
Threads  
The IP Media Server (Global Call) demo operates with two threads, as shown in Figure 4.  
Figure 4. IP Media Server (Global Call) Demo Threads  
IP  
R4/GC  
Keyboard  
SRL  
Main Thread  
Sub-Thread  
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Demo Details  
The threads are created as follows:  
1. The first (main) thread is created by the demo application to get the keyboard input.  
2. The second thread is an SRL thread, created as a result of the demo application calling  
PDLsr_enblhdlr( ). All Global Call events are received through the SRL.  
5.4  
Initialization  
This section describes the IP Media Server (Global Call) demo initialization as shown in Figure 5.  
A system is started in the following sequence:  
1. The application creates CConfig( ) to parse the configuration file.  
2. The application creates CEventRouter( ) to start the Event Router, which, in turn, starts the IP  
module and the Voice module. When a module is started, it initializes its boards, devices and  
state machines.  
After all the modules are started, the EventRouter starts to build a static routing table that maps  
voice devices to IP devices. It is important that each IP device has a dedicated voice resource, so  
that when an IP channel is connected (an incoming call is answered) the user can get a voice  
prompt immediately.  
If the initialization should fails, the application shuts down. The shutdown sequence is the reverse  
of the initialization sequence.  
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Demo Details  
Figure 5. System Initialization  
1. Parse .cfg file  
Application  
Configuration  
Event Router  
2. Start router  
3. Start IP Module  
4. Start IP Board  
5. Start IP Device  
IP Module  
IP Board  
IP Device  
6. Start IP State Machine  
IP State Machine  
7. Start Voice Module  
8. Start Voice Board  
Voice Module  
Voice Board  
9. Start VoiceDevice  
Voice Device  
10. Start Voice State  
Machine  
Voice State  
Machine  
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Demo Details  
5.5  
Event Handling  
This section describes how the IP Media Server (Global Call) demo handles events. It contains the  
following topics:  
5.5.1  
Event Mechanism  
The IP Media Server (Global Call) demo uses the SRL mechanism to retrieve events. When an  
event occurs, SRL calls event handlers automatically. All events are received by the SRL and then  
passed to the CallbackHdlr( ) function for handling.  
In the initialization phase of the demo, the main( ) function sets up the call-back handler, by calling  
PDLsr_enbhdlr( ).  
5.5.2  
5.5.3  
Handling Keyboard Input Events  
There is an endless loop {while(0)} in the main( ) function in the Main.cpp file. In that loop, the  
application waits forever for a keyboard event by calling the waitForKey( ) function. The event  
must be handled immediately and event-specific information should be retrieved before the next  
call to waitForKey( ).  
Handling SRL Events  
When the R4/Global Call event is received, the application performs the following:  
1. Get METAEVENT by calling gc_GetMetaEvent( ).  
2. Get channel ID through device handle to channel mapping.  
3. Get device type through device handle to type mapping.  
4. Route meta event to the module specified by device type.  
5.5.4  
Handling Application Exit Events  
Normal application exit events, such as pressing either q or Q, don’t enter the SRL. The main( )  
function calls PDLSetApplicationExitPath( ) before initialization. In Linux, this function sets the  
signals (SIGINT, SIGTERM, SIGABRT) for making the appropriate exit from the application. In  
Windows, this function enables the detection of CTRL_CLOSE_EVENT (closing the window).  
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Demo Details  
5.5.5  
TSUsrEvent Structure  
The TSUsrEvent structure is used by the demo modules to return event processing results to the  
event router.  
The TSUserEvt structure is defined as follows:  
typedef struct  
{
int  
event;  
TDeviceType destination;  
int  
lineDevice;  
long  
xmitSlot;  
long  
char  
neighborDevice;  
dialString[MAX_STRING_LENGTH]}  
TSUserEvent;  
The fields of the TSUserEvt structure are described as follows:  
event  
the name of a user-defined event, such as USR_CONNECTED, etc.  
destination  
the name of the module that this event is destined for. Possible vavues are IP, VOICE, or  
NONE.  
lineDevice  
the device handle in this module. It will be later used by the Event Router as an index to find its  
counterpart in the destination module.  
xmitSlot  
an integer that normally indicates a time slot number  
neighborDevice  
the neighbor device handle  
dialString  
a char string that is normally filled with a DTMF dialing string  
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Glossary  
Codec: see COder/DECoder  
COder/DECoder: A circuit used to convert analog voice data to digital and digital voice data to analog audio.  
Computer Telephony (CT): Adding computer intelligence to the making, receiving, and managing of  
telephone calls.  
DTMF: Dual-Tone Multi-Frequency  
Dual-Tone Multi-Frequency: A way of signaling consisting of a push-button or touch-tone dial that sends out a  
sound consisting of two discrete tones that are picked up and interpreted by telephone switches (either PBXs or  
central offices).  
Emitting Gateway: called by a G3FE. It initiates IFT service for the calling G3FE and connects to a Receiving  
Gateway.  
E1: The 2.048 Mbps digital carrier system common in Europe.  
FCD file: An ASCII file that lists any non-default parameter settings that are necessary to configure a DM3  
hardware/firmware product for a particular feature set. The downloader utility reads this file, and for each  
parameter listed generates and sends the DM3 message necessary to set that parameter value.  
Frame: A set of SCbus/CT Bus timeslots which are grouped together for synchronization purposes. The period of  
a frame is fixed (at 125 µsec) so that the number of time slots per frame depends on the SCbus/CT Bus data rate.  
G3FE: Group 3 Fax Equipment. A traditional fax machine with analog PSTN interface.  
Gatekeeper: An H.323 entity on the Internet that provides address translation and control access to the network  
for H.323 Terminals and Gateways. The Gatekeeper may also provide other services to the H.323 terminals and  
Gateways, such as bandwidth management and locating Gateways.  
Gateway: A device that converts data into the IP protocol. It often refers to a voice-to-IP device that converts an  
analog voice stream, or a digitized version of the voice, into IP packets.  
H.323: A set of International Telecommunication Union (ITU) standards that define a framework for the  
transmission of real-time voice communications through Internet protocol (IP)-based packet-switched networks.  
The H.323 standards define a gateway and a gatekeeper for customers who need their existing IP networks to  
support voice communications.  
IAF: Internet Aware Fax. The combination of a G3FE and a T.38 gateway.  
IFP: Internet Facsimile Protocol  
IFT: Internet Facsimile Transfer  
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International Telecommunications Union (ITU): An organization established by the United Nations to set  
telecommunications standards, allocate frequencies to various uses, and hold trade shows every four years.  
Internet: An inter-network of networks interconnected by bridges or routers. LANs described in H.323 may be  
considered part of such inter-networks.  
Internet Protocol (IP): The network layer protocol of the transmission control protocol/Internet protocol  
(TCP/IP) suite. Defined in STD 5, Request for Comments (RFC) 791. It is a connectionless, best-effort packet  
switching protocol.  
Internet Service Provider (ISP): A vendor who provides direct access to the Internet.  
Internet Telephony: The transmission of voice over an Internet Protocol (IP) network. Also called Voice over IP  
(VoIP), IP telephony enables users to make telephone calls over the Internet, intranets, or private Local Area  
Networks (LANs) and Wide Area Networks (WANs) that use the Transmission Control Protocol/Internet Protocol  
(TCP/IP).  
ITU: See International Telecommunications Union.  
Jitter: The deviation of a transmission signal in time or phase. It can introduce errors and loss of synchronization  
in high-speed synchronous communications.  
NIC (Network Interface Card): Adapter card inserted into computer that contains necessary software and  
electronics to enable a station to communicate over network.  
PCD file: An ASCII text file that contains product or platform configuration description information that is used  
by the DM3 downloader utility program. Each of these files identifies the hardware configuration and firmware  
modules that make up a specific hardware/firmware product. Each type of DM3-based product used in a system  
requires a product-specific PCD file.  
PSTN: see Public Switched Telephone Network  
Public Switched Telephone Network: The telecommunications network commonly accessed by standard  
telephones, key systems, Private Branch Exchange (PBX) trunks and data equipment.  
Reliable Channel: A transport connection used for reliable transmission of an information stream from its  
source to one or more destinations.  
Reliable Transmission: Transmission of messages from a sender to a receiver using connection-mode data  
transmission. The transmission service guarantees sequenced, error-free, flow-controlled transmission of messages  
to the receiver for the duration of the transport connection.  
RTCP: Real Time Control Protocol  
RTP: Real Time Protocol  
SIP: Session Initiation Protocol: an Internet standard specified by the Internet Engineering Task Force (IETF) in  
RFC 3261. SIP is used to initiate, manage, and terminate interactive sessions between one or more users on the  
Internet.  
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T1: A digital transmission link with a capacity of 1.544 Mbps used in North America. Typically channeled into 24  
digital subscriber level zeros (DS0s), each capable of carrying a single voice conversation or data stream. T1 uses  
two pairs of twisted pair wires.  
TCP: see Transmission Control Protocol  
Terminal: An H.323 Terminal is an endpoint on the local area network which provides for real-time, two-way  
communications with another H.323 terminal, Gateway, or Multipoint Control Unit. This communication consists  
of control, indications, audio, moving color video pictures, and/or data between the two terminals. A terminal may  
provide speech only, speech and data, speech and video, or speech, data, and video.  
Transmission Control Protocol: The TCP/IP standard transport level protocol that provides the reliable, full  
duplex, stream service on which many application protocols depend. TCP allows a process on one machine to send  
a stream of data to a process on another. It is connection-oriented in the sense that before transmitting data,  
participants must establish a connection.  
UDP: see User Datagram Protocol  
UDPTL: Facsimile UDP Transport Layer protocol  
User Datagram Protocol: The TCP/IP standard protocol that allows an application program on one machine to  
send a datagram to an application program on another machine. Conceptually, the important difference between  
UDP datagrams and IP datagrams is that UDP includes a protocol port number, allowing the sender to distinguish  
among multiple destinations on the remote machine.  
VAD: Voice Activity Detection  
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Index  
A
G
application classes 33  
application exit events 42  
gc_GetMetaEvent( ) 42  
GetDeviceXmitSlot( ) 33, 34  
GetDigitCount( ) 38  
GetDigits( ) 38  
C
GetDigitString( ) 38  
CallbackHdlr( ) 42  
GetFaxHandle( ) 36  
CConfig( ) 40  
GetMailBox( ) 39  
CEventRouter( ) 40  
ChannelNumber( ) 33  
CheckAndConvertDigits( ) 39  
GetNumOfDevices( ) 33, 34, 35  
GetNumOfDevicesOnBoard( ) 35  
GetStoppedReason( ) 38  
GetXmitSlot( ) 36, 38  
classes 33  
application classes 33  
IP module classes 34  
command-line switches 21  
commands, keyboard 22  
compiling and linking 18  
configuration files, editing 15  
Connect( ) 36, 38  
H
hardware requirements 13  
I
Init( ) 32  
CreateMailBoxFileName( ) 39  
initialization 40  
InitMailBoxes( ) 39  
interfaces 32  
D
Disconnect( ) 36, 38  
IP module classes 34  
ipmediaserver.cfg configuration file 15  
IPParms( ) 33  
E
editing configuration files 15  
event handling 42  
K
application exit events 42  
keyboard input events 42  
SRL events 42  
keyboard commands 22  
keyboard input events, handling 42  
TSUsrEvent structure 43  
event mechanism 42  
EventRouter 31, 32  
Exit( ) 33  
L
linking 18  
M
F
main( ) 42  
module structure 30  
files, used by demo 27  
FreeMailBox( ) 39  
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O
W
OnPlayComplete( ) 38  
waitForKey( ) 42  
P
ParseConfigFile( ) 33  
PDL files 29  
PDLSetApplicationExitPath( ) 42  
PDLsr_enbhdlr( ) 42  
PDLsr_enblhdlr( ) 40  
Play( ) 38  
ProcessEvent( ) 33  
programming model 30  
R
Record( ) 38  
requirements  
hardware 13  
runtime commands, keyboard 22  
S
SetDeviceReceiveSlot( ) 33, 34, 36  
SetFaxHandle( ) 36  
SetReceiveSlot( ) 38  
source code files 27  
SRL events, handling 42  
starting the demo 21  
stopping the demo 25  
switches, command line 21  
system initialization 41  
system requirements 13  
T
threads 39  
TSUsrEvent structure 43  
U
using the media server 22  
V
voice menu flowchart 24  
Voice Module classes 37  
VoiceParms( ) 33  
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IP Media Server (Global Call) Demo Guide — August 2005  
 

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