Static has returned on VoIP calls

[Boomarang]

Systems B, C, D, E (BCM400 4.0)all connect to or through system A via VOIP, h.323. Jitter buffer is auto, payloads are 30, 30, 30. Customer still complains of intermitant "static" on calls.

I spend a couple days making test calls adn actually heard "white noise", and a lot of garbled words, like lost packets. However, I only heard it on the side of the call that returns to or through site A, as if the port on the network switch was failing.

Here are the steps I've taken to correct the problem:
1) Upgraded 3.5 systems to 4.0
2) Applied current patches
3) Replaced network connection to switch with Cat6
4) Changed port on network switch
5) Changed form LAN2 to LAN1 and back
6) Grounded cabinet to good earth ground
7) Power cycled System A
8) Power cycled netwok switch
9) Power cycled router

The last possible cause could possibly be a copy machine that sits on the other side of a wall, about 10 feet away from the BCM400. This will be moved next week.

Any suggestions?

 

[bluemr2]

Have you done a network assessment?

 

[DBrewsky]

Also, turn on QOS to prioritize the voice packets (DSCP 40 & 46)...


--DB

 

[Boomarang]

Thank you for the responses. Network administrator has assured me that QOS is turned on.

I haven't done any kind of network assesment, and I really don't how to properly test for lost packets. Where can I look for a procedure?

 

[bluemr2]

Its more a software package than a procedure. We use IXchariot software.

 

[BkMesser]

I had a system that would get progressively worse with static. Paging on ip phones would only work on a few of the phones in the paging group also.

The fix turned out to be installing more pec cards in the bcm.

I guess the pec resources were all getting used up.