Aksel, 
i faced a similar issue with remote sip extensions. and seems to be happening 
due to internet problems. one way audio that is .. one of the parties (on site) 
stops hearing the other party.
and it happens with one extension at a random timing and random extension.. and 
if all extensions are on the same internet link it doesnt' happen to all of 
them at once.. only one of them. 
i suggest trying to change ISP for testing. 



Tarek Sawah

Information Technology  Adviser

Integrated Digital Systems

CCNP, MCSE, RHCE, TELECOM

USA: +1 386 492 9993



From: ak...@abacus-it.no
To: asterisk-users@lists.digium.com
Date: Tue, 18 Oct 2011 15:35:41 +0200
Subject: [asterisk-users] Problems during calls



Hello dear list. We run a Asterisk 1.6.2.6 on testbasis (SIP), and experience 
every day, when making calls, that the calls become silent.Not every calls, but 
1 out of 3-4 calls, becomes silent suddenly during the conversation.When we 
then hangup, and redial immediately, the calls do not go through, we then have 
to try redial a couple of times, and then It suddenly gets through.There is 
nothing in the verbose log in Asterisk –r. SIP HW is Snom and Different types 
of Cisco. Anyone got an idea? Or at lest know how to dig deeper in logs? Med 
vennlig hilsen / Best regardsAbacus IT AS- din Visma Software Partner- your 
Visma Software Partner L.Aksel CelasunMobilnummer/cell phone: (+47) 900 15 
103Sentralbord/Support 4000 1850ak...@abacus-it.no Se denne månedens gode 
tilbud fra Abacus IT AS  
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