SIP SIMPLE Client SDK

h2. sip-audio-session

h3. Description

This script can be used for interactive audio session or for scripting alarms. The script returns appropriate shell response codes for failed or successful sessions. The script can be setup to auto answer and auto hangup after predefined number of seconds, detects SIP negative response codes, missing ACK and the lack of RTP media after a session has been established. Once the media stream is connected, the outcome of the ICE negotiation and the selected RTP candidates are displayed.

> This script is available in _sipclients_ package that must be installed separately from SIP SIMPLe client SDK package.

<pre>

adigeo@ag-blink:~$sip-audio-session -h

Usage: sip-audio-session [options] [user@domain]

This script can sit idle waiting for an incoming audio session, or initiate an

outgoing audio session to a SIP address. The program will close the session

and quit when Ctrl+D is pressed.

Options:

  -h, --help            show this help message and exit

  -a NAME, --account=NAME

                        The account name to use for any outgoing traffic. If

                        not supplied, the default account will be used.

  -c FILE, --config-file=FILE

                        The path to a configuration file to use. This

                        overrides the default location of the configuration

                        file.

  -s, --trace-sip       Dump the raw contents of incoming and outgoing SIP

                        messages.

  -j, --trace-pjsip     Print PJSIP logging output.

  -n, --trace-notifications

                        Print all notifications (disabled by default).

  -S, --disable-sound   Disables initializing the sound card.

  --auto-answer         Interval after which to answer an incoming session

                        (disabled by default). If the option is specified but

                        the interval is not, it defaults to 0 (accept the

                        session as soon as it starts ringing).

  --auto-hangup         Interval after which to hang up an established session

                        (disabled by default). If the option is specified but

                        the interval is not, it defaults to 0 (hangup the

                        session as soon as it connects).

  -b, --batch           Run the program in batch mode: reading input from the

                        console is disabled and the option --auto-answer is

                        implied. This is particularly useful when running this

                        script in a non-interactive environment.

  -D, --daemonize       Enable running this program as a deamon. This option

                        implies --disable-sound, --auto-answer and --batch.

</pre>

h3. Incoming Session

<pre>

adigeo@ag-blink:~$sip-audio-session 

Using account 31208005169@ag-projects.com

Logging SIP trace to file "/Users/adigeo/Library/Application Support/Blink/logs/sip_trace.txt"

Logging PJSIP trace to file "/Users/adigeo/Library/Application Support/Blink/logs/pjsip_trace.txt"

Available audio input devices: None, system_default, Built-in Input, Built-in Microphone

Available audio output devices: None, system_default, Built-in Output

Using audio input device: Built-in Microphone

Using audio output device: Built-in Output

Using audio alert device: Built-in Output

Available control keys:

  s: toggle SIP trace on the console

  j: toggle PJSIP trace on the console

  n: toggle notifications trace on the console

  p: toggle printing RTP statistics on the console

  h: hang-up the active session

  r: toggle audio recording

  m: mute the microphone

  i: change audio input device

  o: change audio output device

  a: change audio alert device

  <>: adjust echo cancellation

  SPACE: hold/unhold

  Ctrl-d: quit the program

  ?: display this help message

2009-08-25 16:37:12 Registered contact "sip:hxsyungk@192.168.1.124:59164" for sip:31208005169@ag-projects.com 

at 81.23.228.150:5060;transport=udp (expires in 600 seconds).

Other registered contacts:

  sip:31208005169@192.168.1.123:5060 (expires in 274 seconds)

  sip:kwbfxyvl@192.168.1.124:59116 (expires in 522 seconds)

  sip:ilmegvkp@192.168.1.124:59003 (expires in 339 seconds)

  sip:31208005169@192.168.1.1;uniq=5B2860C44383A3D6705629A7E1FB8 (expires in 1162 seconds)

Detected NAT type: Port Restricted

Incoming audio session from 'sip:adi@umts.ro', do you want to accept? (y/n)

Audio session established using "speex" codec at 16000Hz

Audio RTP endpoints 192.168.1.124:50378 <-> 85.17.186.6:58868

RTP audio stream is encrypted

Remote SIP User Agent is "Blink-0.9.0"

Remote party has put the audio session on hold

Audio session is put on hold

Audio session ended by remote party

Session duration was 6 seconds

2009-08-25 16:37:44 Registration ended.

</pre>

h3. Outgoing Session

<pre>

adigeo@ag-blink:~$sip-audio-session -a umts ag@ag-projects.com

Using account adi@umts.ro

Logging SIP trace to file "/Users/adigeo/Library/Application Support/Blink/logs/sip_trace.txt"

Logging PJSIP trace to file "/Users/adigeo/Library/Application Support/Blink/logs/pjsip_trace.txt"

Available audio input devices: None, system_default, Built-in Input, Built-in Microphone

Available audio output devices: None, system_default, Built-in Output

Using audio input device: Built-in Microphone

Using audio output device: Built-in Output

Using audio alert device: Built-in Output

Available control keys:

  s: toggle SIP trace on the console

  j: toggle PJSIP trace on the console

  n: toggle notifications trace on the console

  p: toggle printing RTP statistics on the console

  h: hang-up the active session

  r: toggle audio recording

  m: mute the microphone

  i: change audio input device

  o: change audio output device

  a: change audio alert device

  <>: adjust echo cancellation

  SPACE: hold/unhold

  Ctrl-d: quit the program

  ?: display this help message

Initiating SIP audio session from 'sip:adi@umts.ro' to 'sip:ag@ag-projects.com' via sip:85.17.186.7:5060;transport=udp...

Audio session established using "speex" codec at 16000Hz

ICE negotiation succeeded in 1s:412

Audio RTP endpoints 192.168.1.124:50852 (ICE type host) <-> 192.168.1.124:50871 (ICE type host)

RTP audio stream is encrypted

Audio session is put on hold

Remote party has put the audio session on hold

Detected NAT type: Port Restricted

Ending audio session...

Audio session ended by local party

Session duration was 7 seconds

</pre>

h3. Alarm System

sip-audio-session script can be used for end-to-end testing of a SIP service including the RTP media path. The following failures can be detected:

* Timeout

* Negative response code

* Lack of RTP media after the SIP session has been established

* Missing ACK

To setup the alarm system start periodically a caller script from a monitoring software using the following arguments:

  <pre>

sip-audio-session --auto-hangup user@domain

</pre>

Where the user@domain has been configured as the SIP account of the listener, can be an answering machine on the PSTN network. The caller script hangs up after each call. The shell return code can be used to determine if the session setup has failed.

To receive calls and answer them automatically you can also use sip_audio_session script as follows:

  <pre>

sip-audio-session --daemonize

</pre>

You must run the script as user root. The --daemonize option puts the client in the background and the logging goes to /var/log/syslog. The program saves its pid file to /var/run/sip_audio_session.pid.