[asterisk-users] T38 state values

Joshua C. Colp
Wed, 23 Mar 2022 22:15:34 -0000

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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