[asterisk-users] Help calls being dropped - maximum retries exceeded on trasmission

[Enrique]

Hello all.

I'm rather new. I'm lost and I would really appreciate if someone can 
point me in the right direction.  I don't know if it something we did
wrong or if it's an issue with our SIP TSP.

We have a new Asterisk 1.4.26 server that has been running without a 
hitch for several days.

I have two TSPs connected via SIP and one Linksys SPA-400 with 4 FXO ports. 
Calls are arriving correctly via the SPA-400 and one of our carriers. 
However, all calls from the other SIP operator are being dropped.

Going through /var/log/messages I see that everything was working 
fine until suddenly, in the middle of the night, we started getting 
the following error messages on every call that arrived on one SIP trunk.

	[Aug  7 00:03:23] WARNING[7310] chan_sip.c: Maximum 
	retries exceeded on transmission 17BC7D93-81FB11DE-
	B87DF06A-EE73E78D at xxx.yyy.119.39 for seqno 101 
	(Critical Response) -- See doc/sip-retransmit.txt.

	[Aug  7 00:03:23] WARNING[7310] chan_sip.c: Hanging up 
	call 17BC7D93-81FB11DE-B87DF06A-EE73E78D at xxx.yyy.119.39 
	- no reply to our critical packet (see doc/sip-retransmit.txt).

now I just get this (on every call from the faulty trunk)

	[Aug  7 17:00:24] WARNING[8308] chan_sip.c: Maximum retries
	exceeded on transmission
3F4276AB-829A11DE-B7F6898E-F04A96 at xxx.22.119.35
	for seqno 101 (Critical Response) -- See doc/sip-retransmit.txt.

	[Aug  7 17:00:24] WARNING[8308] chan_sip.c: Hanging up call 
	3F4276AB-829A11DE-B7F6898E-F04A96 at xxx.22.119.35 - no reply to 
	our critical packet (see doc/sip-retransmit.txt).

I did make a trivial change to the extensions.conf yesterday at 6pm but 
the system was taking calls correctly until midnight.


All help is greatly appreciated.

Regards,
Enrique


Enrique Mora
emora at context.es