[asterisk-users] No audio for 10 seconds and then comfort noise

[David Cunningham]

Hi Joshua,

You're right, it was a firewall problem. One of those things where testing
a change in one place throws up a previously unseen problem somewhere else!
Thanks for the tip.


On Thu, 19 May 2022 at 21:18, Joshua C. Colp <jcolp at sangoma.com> wrote:

> On Thu, May 19, 2022 at 6:04 AM David Cunningham <
> dcunningham at voisonics.com> wrote:
>
>> Hi Dovid and Joshua,
>>
>> The PSTN is sending RTP immediately after the 200 OK, on both legs of the
>> call. Since the PCAP taken on the Asterisk server itself shows this RTP
>> from the PSTN then presumably it can't be a network issue preventing the
>> RTP.
>>
>> Having said that, the problem is not reproduced when the peer is another
>> Asterisk server on the same network, and that does point to a network
>> difference.
>>
>> Is there any other way in which the RTP keepalive might affect Asterisk's
>> behaviour?
>>
>
> No, the option only does anything if no RTP has been sent for a period of
> time. It doesn't fundamentally alter the behavior of RTP in general.
>
> Another thing to consider is that a PCAP is taken before any local
> firewall rules are applied, which can give a false impression that the
> firewall on the system is not an issue when in reality it can be. That's
> something to check.
>
> --
> 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/
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782
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