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Temporary silent lines

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nym313

Technical User
Jan 23, 2007
38
HU
Hi.
I have a very weird problem but cant seem to find the cause.
Config:
IP412/VCM30.
SlotA: PRI60
SlotB: PRI30 (qsig to another pbx)

There are 28 5610 IP phones in the Call Center.
Every day when there is a heavy load either all or some of the calls go silent.
Under silent I mean that the agents cannot hear the the caller, but the caller can hear the agent. This goes on from 2,3 seconds to max 10 seconds. After that the call is restored.
I have done multiple monitor traces but cannot find anything. The network and switch is also ok, no packet losses.
The provider has changed the ISDN NT, and also has done multiple traces without, and did not find any errors.
I tried to ping the IP office, and I get an average response of 4ms, but by my experience every other IP office has a higher than 1ms response time, so Im guessing this is ok.
Im starting to suspect that it is because of a faulty VCM module.
Is there any way of checking if the reason is the VCM module or has anybody else had a similiar experience?
 
>>Every day when there is a heavy load either all or some of the calls go silent.


Sorry but this says it all. Did you have a network assesment done before having this up and running.
Does your network have QoS running?

ACA - IP Office Implement
ACA - IP Telephony
ACS - IP Office Implement
CCNA - Working towards.
 
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