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

[Joshua C. Colp]

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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