On 07/01/2011 02:24 PM, Worley, Dale R (Dale) wrote: >> From: Johnson, Michael A [michael.a.john...@team.telstra.com] >> >> The PBX (Mitel) that sends the re-invite without SDP, that then >> accepts the offered G.729 codec from the ISP, despite not being able >> support the codec is the device I believe is as fault. The >> manufacturer however disagrees. > > You're still not being clear, but it's clear enough that I can > understand what you're talking about. You are saying: > > The PBX sends an re-INVITE without SDP. > > The ISP sends a 200 response with SDP.
If I'm following correctly, this offer includes G.729 and G.711. > The PBX "accepts" this response (in some manner that you don't > describe) and sends ACK. The PBX includes an SDP answer in this ACK (as it must), but incorrectly (because of its own limitations) includes G.729 in the answer. > > You consider this to be a fault on the part of the PBX, but you > don't specify why. > > I believe your misunderstanding is in regard to the PBX sending the > ACK. The PBX does not "accept" the 200 response. It receives the 200 > response and *must* then send an ACK. There is no way for it to > "reject" the response. (This has been discussed in many contexts, > which I'm too lazy to look up right now.) I would think that if the PBX only included G.711 in its SDP answer (included in the ACK), all would be well. -- Kevin P. Fleming Digium, Inc. | Director of Software Technologies Jabber: kflem...@digium.com | SIP: kpflem...@digium.com | Skype: kpfleming 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA Check us out at www.digium.com & www.asterisk.org _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
