[asterisk-users] SIP Codec negotiation

Steve Edwards asterisk.org at sedwards.com
Thu May 10 13:44:14 CDT 2018

I receive an INVITE/SDP containing:

 	m=audio 11310 RTP/AVP 3 0 101

which I interpret as gsm, ulaw, rfc2833.

and I reply with an OK/SDP containing:

 	m=audio 15884 RTP/AVP 0 3 101

which I interpret as ulaw, gsm, rfc2833.

How can I tell which codec was actually used for the call?

Thanks in advance,
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST

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