How to Verify a SIP Codec in Use
The Session Initiation Protocol (SIP) is a communication protocol that is used for voice and multimedia sessions. Information sent along the SIP protocol can be encoded in any number of video formats with the Asterisk PBX. This requires the computer at the processing end of the transmission to be able to decode or interpret this file in order to properly play it back. You can see what protocols each SIP client is currently using from the Asterisk command line.
Instructions
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Log in to your Asterisk server by using SSH or by physically accessing the console. You must supply an administrative name and password.
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Open the Asterisk management console by typing "asterisk -r" (minus quotes).
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Type "show codecs **" (minus quotes) to display a list of all actively used codecs and the users engaged with them.
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