[Freeswitch-users] Multiple 183 SDP Change Codecs - allowed?

[Avi Marcus]

Indeed both are enabled... check the PCAP from the original message:
http://ge.tt/7MpyBwJ
It shows I'm offering in the original invite: audio 28380 RTP/AVP *8 0* 9
101 13

I remember this similar issue with 18x have a different codec than a 200
and Anthony said it was against the RFC but
http://wiki.freeswitch.org/wiki/NDLB#NDLB-allow-nondup-sdp would allow that
broken behavior.
I'm wondering if this is the same thing if so what RFC to point the vendor
to.

Would there be a potential negative to turning on this NDLB setting?

-Avi



On Tue, Jul 3, 2012 at 5:50 PM, Steven Ayre <steveayre at gmail.com> wrote:

> Actually rereading the trace, it looks like you have both PCMU & PCMA
> enabled on lines 39-40.
> AviMarcus, Can you confirm your codec preferences to be sure?
>
> If so, it appears to only be comparing the codec in the 2nd SDP to the
> codec that's been selected for the call, not to all the codecs enabled on
> the profile. That does sound like a bug, unless there's some parameter set
> that's intentionally causing that behaviour...
>
> -Steve
>
>
>
>
> On 3 July 2012 15:46, Steven Ayre <steveayre at gmail.com> wrote:
>
>> Looking at lines 75-78 you have PCMA enabled on FS as a codec option but
>> not PCMU.
>>
>> When it goes to change to the PCMU codec it looks through the enabled
>> codecs but doesn't find PCMU so hangs up the call with
>> INCOMPATIBLE_DESTINATION.
>>
>> You need to add both PCMA and PCMU in your codec preferences.
>>
>> -Steve
>>
>>
>>
>>
>> On 3 July 2012 14:38, Avi Marcus <avi at avimarcus.net> wrote:
>>
>>> If so.. which I think is not.. is this a bug then in FS?
>>>
>>> http://pastebin.freeswitch.org/19423
>>> You see from the first SDP that PCMU and PCMA were both options.
>>> Then for the next SDP FreeSWITCH was only considering PCMU which was the
>>> one that got chosen by the first SDP.
>>>
>>> Voxbeam claims it's not their fault.. is it?
>>>
>>>  -Avi
>>>
>>>
>>>
>>> On Tue, Jul 3, 2012 at 4:26 PM, Kristian Kielhofner <kris at kriskinc.com>wrote:
>>>
>>>> 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 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
>>>> > 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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>>>>
>>>> --
>>>> Kristian Kielhofner
>>>>
>>>>
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>>
>
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