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I know this has been covered many times in the past, but I can't find a resolution in one of the threads.
I have a a freeswitch box running an older version of 1.4. Preparing to upgrade to 1.6 in the next few weeks.
I cannot for the life of me get sip_append_audio_sdp=a=fmtp:18 annexb=no to rewrite the attribute, no matter how I try.It seems to be doing it in the dialplan, but it has no effect on the SDP. I've tried it with an "answer" but it just removes the annexb line completely, which, according to the docs, is G729B. Late negotiation is enabled.