[asterisk-users] SIP/IAX peers UNREACHABLE and audio loss

[Edoardo Serra]

Hi all,
	I'm having a problem with some Asterisk servers interconnected with 
each other using IAX (I also tried with SIP without solving the problem)

Sometimes, with apparently no reason, some peers become UNREACHABLE
(I have qualify=yes in iax.conf) and REACHABLE again as soon as
another qualify test is made.

Our users are also complaining about audio loss during their calls,
apparently randomly, everything goes ok for days and bad for another few 
days.

I strongly believe the 2 problems are strictly related because in the 
logs I see REACHABLE / UNREACHABLE messages only for certains days
without regularity.
The days in wich i see a lot of messages are exactly the days with
most of complaint about audio loss

I just noticed that timestamps of the logs (REACHABLE / UNREACHABLE)
are quite always during business hours, this makes me think at somewhat 
related to load (cpu load, badwidth load, calls load, etc...)

But, looking at hardware specs of our lan, servers and average load I 
don't think they are over-stressed.

Our servers are all:
2 x Intel(R) Xeon(TM) CPU 3.20GHz
1 GB RAM
2 x IDE HDDs Software RAID 1
Asterisk 1.2.13 with res_perl
Gentoo Linux
Some of them has a Sangoma card connected with an E1

Most ot these are on the same LAN, interconnected with a 1 GB switch
(I don't think it should be a bandwidth problem).

Load averages of these server is varying from 0.5 to 1.0
(I guess it should be ok)

On each server we don't have more than 50 concurrent calls
(bridged SIP <-> IAX2 or IAX2 <-> ZAP)

Used codec is mostly G729

Sometimes on asterisk cli i see some messages like
"Avoided initial deadlock for '0x9fd130', 10 retries!"
I don't know if it could be somehow related.

Someone of you can point me in the right direction ?

Tnx in advance

Regards

Ing. Edoardo Serra
WeBRainstorm S.r.l.