[Freeswitch-users] Forcing CN offer

[Alex Massover]

Hello,

That's great, if the other party's stack is not happy without a=, I'll turn on the variable.

Many thanks! 

> -----Original Message-----
> From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-
> users-bounces at lists.freeswitch.org] On Behalf Of Anthony Minessale
> Sent: יום ה 25 אוגוסט 2011 19:31
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Forcing CN offer
> 
> if you set the var verbose_sdp=true globally in vars.xml or on a
> per_leg basis you will get the extra a= that some things mistakenly
> think are mandatory (like some older polycom firmwares) the goal is to
> make the sdp as small as possible to prevent going over the MTU
> 
> On Thu, Aug 25, 2011 at 4:25 AM, Alex Massover <alex at jajah.com> wrote:
> > Hello,
> >
> >
> >
> > I’m working on the following scenarios:
> >
> > scenario 1:  A  à FS à B
> >
> > scenario 2: C à FS à A
> >
> >
> >
> > Where A supports CN (a=rtpmap:13 CN/8000) and requires CN
> negotiation, and B
> > and C do not support and aren’t able to negotiate it.
> >
> >
> >
> > I successfully implemented scenario 1, CN is negotiated between A
> party and
> > FS, and not negotiated between FS and B.
> >
> >
> >
> > But scenario 2 doesn’t work for me! When C doesn’t offer CN in INVITE
> > towards FS, FS also doesn’t offer CN in SDP in INVITE towards A.
> >
> > And nothing helps, tried all the combination of VAD options. Gateway
> A is in
> > the same internal sip profile in both scenarios.
> >
> >
> >
> > This is the SDP in INVITE from C to FS:
> >
> >
> >
> >             Media Description, name and address (m): audio 30224
> RTP/AVP 0 8
> > 18 101
> >
> >             Media Attribute (a): rtpmap:0 PCMU/8000
> >
> >             Media Attribute (a): rtpmap:8 PCMA/8000
> >
> >             Media Attribute (a): rtpmap:18 G729/8000
> >
> >             Media Attribute (a): fmtp:18 annexb=no
> >
> >             Media Attribute (a): rtpmap:101 telephone-event/8000
> >
> >             Media Attribute (a): fmtp:101 0-16
> >
> >             Media Attribute (a): silenceSupp:off - - - -
> >
> >             Media Attribute (a): ptime:20
> >
> >             Media Attribute (a): sendrecv
> >
> >
> >
> >
> >
> > And this is the SDP from FS towards A:
> >
> >             Media Description, name and address (m): audio 23564
> RTP/AVP 0 8
> > 101 13
> >
> >             Media Attribute (a): rtpmap:101 telephone-event/8000
> >
> >             Media Attribute (a): fmtp:101 0-16
> >
> >             Media Attribute (a): ptime:20
> >
> >
> >
> > FS even puts 13 in m= attribute, but doesn’t add a=  attribute for
> > rtpmap:13.
> >
> >
> >
> >
> >
> > Is that a bug?
> >
> >
> >
> >
> >
> > --
> >
> > Best Regards
> >
> > Alex Massover.
> >
> > This mail was sent via Mail-SeCure System.
> >
> >
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> >
> >
> 
> 
> 
> --
> Anthony Minessale II
> 
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