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

[Matthew Jordan]

On 01/26/2013 07:26 AM, Andreas Sikkema wrote:
> On 1/18/13 13:24 , Matthew Jordan wrote:
>> 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.
> 
> 
> I ran into a similar problem this week. There's a number of SIP
> implementations (either legacy or not good enough) that don't handle a
> zero port denial of a media stream quite right.
> 
> In the past these implementations would have worked fine when the called
> party would have just ignored the offending media stream, instead of
> sending an explicit deny.
> 

A part of me wonders is if you're really running into the issue
described on ASTERISK-20908 [1]. Do you mind trying the patch on there
to see if it helps?

If it does, then the culprit isn't the 0 port but the lack of a
terminating '\r\n' on the offer.

[1] https://issues.asterisk.org/jira/browse/ASTERISK-20908

-- 
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