[Freeswitch-users] Multiple 183 SDP Change Codecs - allowed?
kris at kriskinc.com
Tue Jul 3 17:26:48 MSD 2012
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
On Tue, Jul 3, 2012 at 1:04 AM, Avi Marcus <avi at avimarcus.net> wrote:
> Are multiple 183s from the endpoint that changes the SDP allowed? I'm under
> the impression this is broken, similar to
> ... 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
> And just curious.. what would make this allowed? A re-INVITE..?
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