[Asterisk-Users] Disconnection Problem

[usman at user.iphonica.net]

Hi ! 
I am facing a serious discennection problem with asterisk queues. Now I am 
basically running a call center where users land from allover the place 
through internet. I am using asterisk queues to queue them and then they 
are forwarded to agents. Now what happens is that after some time randomly 
some calls get disconnected and Astersik basically sends the SIP "BYE" 
packet to both parties. Sometimes it happens that calls may go over 20 
minutes and sometimes after just 2 minutes they get disconnected. I am 
using free Intel G.729 codec for testing. Can somebody guide me what might 
be wrong ?
thanks !
usman.