Avi, Multiple 18x responses that change the SDP are allowed. I can't find the specific document text now but as a random guy on the internet (for whatever that's worth) I'm certain it is allowed. A re-INVITE can't be sent from either side until the dialog has been established (200+ACK). In a case where the UAC (caller) would like to update the session before it is established method UPDATE must be used. On Tue, Jul 3, 2012 at 1:04 AM, Avi Marcus <avi@avimarcus.net> wrote:
Are multiple 183s from the endpoint that changes the SDP allowed? I'm under the impression this is broken, similar to http://wiki.freeswitch.org/wiki/NDLB#NDLB-allow-nondup-sdp ... which is why when the codec changes, FS freaks out and cancels the call because of codec negotiation error. Does that NDLB flag allow this, too?
First has: audio 10116 RTP/AVP 0 101 13 Second has: audio 49020 RTP/AVP 8 13 101 PCAP: http://ge.tt/7MpyBwJ
Can someone point me to the specific RFC so I can tell the supplier to fix it? And just curious.. what would make this allowed? A re-INVITE..?
-Avi
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