[asterisk-users] asterisk 13.16 / pjsip / t.38: res_pjsip_t38.c:207 t38_automatic_reject: Automatically rejecting T.38 request on channel 'PJSIP/91-00000007'

Joshua Colp jcolp at digium.com
Fri Jun 16 09:00:49 CDT 2017

On Fri, Jun 16, 2017, at 10:49 AM, Michael Maier wrote:


> t38modem and asterisk are using
> m=image 35622 udptl t38
>                ^^^^^
> Provider uses
> m=image 35622 UDPTL t38
>                ^^^^^
> Could this be a problem? If I'm sending internal only, it's always 
> lowercase.

Looking at the tests we have we only use 'udptl' as the transport.
Without diving deep into the SDP negotiator it is possible that it gets
upset at that, as we would only produce 'udptl'. If the SDP negotiator
in PJSIP is case sensitive then you'd get a declined stream like you
see. Looking at the T.38 examples from the ITU doc also shows it in
lowercase, so uppercase is probably not commonly used.

Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org

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