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

[Anthony Minessale]

if its a sip forked dial.  We do not support that.

On Tue, Jul 3, 2012 at 10:56 AM, Avi Marcus <avi at avimarcus.net> wrote:
> They said the 1st carrier rejected it so the second 183 is from a second
> carrier.. but yes, the first carrier shouldn't be sending a 183...
> Anyway -- if you please look at the pcap from the first email, the log I
> posted a link to later, or the past two emails -- you'll see FS originally
> offers both PCMU and PCMA in the initial invite.
>
> I think we need Anthony to chime in here... he knows the RFC stuff!
>
> -Avi
>
>
>
> On Tue, Jul 3, 2012 at 6:22 PM, Kristian Kielhofner <kris at kriskinc.com>
> wrote:
>>
>> That's pretty nasty of voxbeam to do...  Considering they return the
>> first 183 less than one second after the initial INVITE I'd say it's
>> very likely they're providing false ringback and/or FAS (false answer
>> supervision).  Meanwhile the actual ringback comes over two seconds
>> later with PCMA.  That's shady and if I were you I'd switch carriers
>> just on principle.
>>
>> However, as I said before they're not doing anything that's not
>> allowed by the various specifications although FAS is considered by
>> many as fraud.
>>
>> What are your codec settings like?  Perhaps FS is rejecting PCMA
>> because you're not allowing it?
>>
>> On Tue, Jul 3, 2012 at 9:38 AM, 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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>> >> > 
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>> >>
>> >>
>> >> --
>> >> Kristian Kielhofner
>> >>
>> >>
>> >> _________________________________________________________________________
>> >> Professional FreeSWITCH Consulting Services:
>> >> consulting at freeswitch.org
>> >> http://www.freeswitchsolutions.com
>> >>
>> >> 
>> >> 
>> >>
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>> >>
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>> >
>> >
>> >
>> > _________________________________________________________________________
>> > Professional FreeSWITCH Consulting Services:
>> > consulting at freeswitch.org
>> > http://www.freeswitchsolutions.com
>> >
>> > 
>> > 
>> >
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>> >
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>>
>>
>>
>> --
>> Kristian Kielhofner
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
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>>
>> Join Us At ClueCon - Aug 7-9, 2012
>>
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>
>
>
> _________________________________________________________________________
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>
> 
> 
>
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>
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-- 
Anthony Minessale II

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