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

[Avi Marcus]

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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> >> --
> >> Kristian Kielhofner
> >>
> >>
> _________________________________________________________________________
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> > 
> > 
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>
>
> --
> Kristian Kielhofner
>
> _________________________________________________________________________
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>
> 
> 
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