[asterisk-users] Asterisk 1.8 drop calls after 15 minutes

[Administrator TOOTAI]

Hi all,

I face the subject strange behavior: calls arre dropped after 15 minutes 
on an asterisk 1.8.15.0. Only phones (SNOM300) connected to the Asterisk 
through OpenVPN seems to have the problem.

 From CDR, I see for 3 calls from this morning I'm aware of, that 
asterisk hangup after respectively 899s 894s 898s

In logs I see

WARNING[8213] chan_sip.c: Retransmission timeout reached on transmission 
522eec628683-uy8xshd6wc21 for seqno 102 (Critical Request) -- See 
https://wiki.a
Packet timed out after 6401ms with no response (or 6399ms or 6401ms)

Qualify freq being 60000 ms for the peers.

For the SIP peers I see

   Sess-Timers  : Accept
   Sess-Refresh : uas
   Sess-Expires : 1800 secs
   Min-Sess     : 90 secs

I tried to use originate for session-timer in global SIP conf, no changes.

Any hint about this matter would be appreciate.

-- 
Daniel