[asterisk-users] T38 state values

[David Cunningham]

Hi Joshua,

Thank you for that. In the end it seems to have been a firewall blocking
the UDPTL ports.


On Thu, 24 Mar 2022 at 11:15, Joshua C. Colp <jcolp at sangoma.com> wrote:

> On Wed, Mar 23, 2022 at 7:07 PM David Cunningham <
> dcunningham at voisonics.com> wrote:
>
>> Hi Joshua,
>>
>> Thanks very much for that information. I guess in that case the 'not
>> working' scenario has a T38 state of 'T38 was negotiated and is active',
>> which doesn't help us find the problem much.
>>
>> In this case the T38 is passthrough, and in the not working scenario in a
>> PCAP we see:
>> PSTN -> Asterisk: 't30ind: cng' packet is received
>> Asterisk -> ATA: 't30ind: cng' is not sent
>>
>> Would you have any suggestion on what could prevent the 't30ind: cng'
>> being passed through? The Asterisk T38 settings in sip.conf are:
>>
>> t38pt_udptl = yes
>> t38_udptl = yes
>> t38pt_rtp = no
>> t38pt_tcp = no
>>
>> Thanks again.
>>
>
> Nope. You could see if increasing the core debug and enabling udptl debug
> on the console sheds any light, otherwise it's just digging into things.
>
> --
> Joshua C. Colp
> Asterisk Technical Lead
> Sangoma Technologies
> Check us out at www.sangoma.com and www.asterisk.org
> --
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-- 
David Cunningham, Voisonics Limited
http://voisonics.com/
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