asterisk users - Feb 2023 - 5s delays before executing the dialplan

On Tue, Feb 28, 2023 at 9:48 AM Kingsley Tart <kingsley at dns99.co.uk>
wrote:
> Hi,
>
> We've recently hit an issue with Asterisk 18.8.0 where a call comes in
> via SIP (using pjsip) but it can take 5 seconds before starting to
> execute the dialplan.
>
> This was intermittent, but frequent (eg approx half of the calls).
>
> We have verbose logging on, but I didn't see any errors.
>
> Running asterisk -r -vvvv and then watching SIP traffic in another
> window showed the INVITE coming in, then a good 5 seconds before
> dialplan execution started showing within the Asterisk console.
>
> We've never seen this before, but it affected 6 our of 8 of our
> Asterisk servers. They're running in debian 11 VMS, with the VMs
> running under KVM on the host OS which is also debian 11.
>
> Any suggestions where to look next? We've been running Asterisk for
> years but never seen this issue before.
>
> FWIW, the match= lines for the SIP proxies sending to Asterisk are
> configured by IPv4 address, not host name.
>
Is the local hostname configured in /etc/hosts and not reliant on an
outside DNS server? Are you using ICE or STUN at all?

-- 
Joshua C. Colp
Asterisk Project Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org
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On Tue, 2023-02-28 at 09:50 -0400, Joshua C. Colp wrote:
> Is the local hostname configured in /etc/hosts and not reliant on an
> outside DNS server? Are you using ICE or STUN at all?
Hi,

thanks for responding.

No ICE or STUN.

Some of the servers have entries for themselves in /etc/hosts and some
rely on external DNS. That is not by design, it's just how it happened
and I shall sort that out.

I can't figure out how whether the delays were on only the ones without
/etc/hosts entries, but I can be sure that some without those entries
definitely did experience those delays.

Does 5 seconds match some sort of DNS timeout within Asterisk that
could have been the cause?

Cheers,
Kingsley.
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