[asterisk-users] Asterisk 11- Answer with [m=image 0 udptl t38] and Call Drop

[Salman Zafar]

Thanks Matt, that is exactly what I was looking for.

On Fri, Jan 18, 2013 at 5:24 PM, Matthew Jordan <mjordan at digium.com> wrote:

> On 01/18/2013 05:37 AM, Salman Zafar wrote:
>
> > No luck so far, should I consider it a bug in Asterisk 11 as I have
> > tried different version of Asterisk 11 as well. Carrier sends BYE with
> > service not implemented where as asterisk advertise udptl in  SDP for
> > Answer. I do not want it to be advertised by Asterisk 11 in Answer() as
> > I am not using it(udptl, fax etc) in any case.
> >
> >
>
> It is not a bug in Asterisk. Asterisk is following what the RFC says it
> MUST do. It is, however, a bug with your carrier. I would do the following:
>
> 1) Contact your carrier and ask why they are rejecting the 200 OK.
>
> 2) Assuming they won't change their behaviour, find out what they want
> in a response that declines an image media format. Without knowing what
> your carrier thinks the SDP should look like, any modifications you make
> to Asterisk will be guesses.
>
> 3) When you find out what they want, modify chan_sip so that it answers
> back with whatever they told you they want. This will occur in
> chan_sip's add_sdp method - in particular, look for the portion where
> add_sdp adds *either* the m_modem/a_modem strings to the SDP *or* the
> pre-formatted decline_m_line.
>
> Matt
>
> --
> Matthew Jordan
> Digium, Inc. | Engineering Manager
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at: http://digium.com & http://asterisk.org
>
>
> --
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-- 
Regards

**************************
Muhammad Salman Zafar
***************************
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