FreeSWITCH Sangoma Transcoding Operation

Once the sangoma transcoding configuration file is created by sngtc_cfg configuratior we can start FreeSWITCH and load mod_sangoma_codec.so module from the FS CLI.

 FS CLI> load mod_sangoma_codec

An alternative for production systems is add the line <load module="mod_sangoma_codec"/> to conf/autoload_configs/modules.conf.xml to get the codec module loaded at FS startup.

At this point the module will read the sangoma_codec.conf.xml configuration and load the configured codecs. FreeSWITCH will make use of the codecs as necessary.

You can verify which codecs were registered by the module using the FS native command to list codecs:

FS CLI> show codecs

Several codecs will be listed, all codecs prefixed with "Sangoma" are registered by the module, for example: "Sangoma G729" or "Sangoma G.726 32k".

You can use several commands to monitor the usage of the codecs:

This command will show each vocallo configured settings.

FS CLI> sangoma_codec settings

This command will show all current RTP transcoding sessions created by FreeSWITCH along with some statistics about Rx/Tx and lost RTP packets and read average times that can be used for debugging purposes. The first column show the session unique identifier for the transcoding session, you can use that identifier to query more information about that particular session using "sangoma_codec stats".

FS CLI> sangoma_codec sessions

This command will show the FreeSWITCH RTP statistics in the transcoding sessions. Each transcoding session has a RTP connection associated. You can dump the RTP counters with this command:

FS CLI> sangoma_codec stats <session number>