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@lists.freeswitch.org [mailto:freeswitch- users-bounces@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@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.

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