[cisco-voip] Static noise on FXO ports

[OConnell, Ryan]

Hello all,

 

I've been battling this issue with what was suppose to be a simple
little CME install for 10 people for a little while now and I'm at my
wits end. My customer has a 2801 router with VIC2-4FXO a single PVDM2-8
DSP and an 8 port powered Etherswitch module. I have turned vad on/off,
comfort noise on/off, I have played with input gain, output gain, and
impedance settings. I tested the pots lines with a regular analog phone
I get no noise at all. When making a call as soon as the call is
connected the static starts. Internal IP to IP phone calls are great and
calls over the WAN are great. TAC had me do a procedure where I captured
the voice to a wav file before it went through the DSP and after it went
through the DSP and the static can not be heard. I also got the TELCO in
to test the lines for any nuances and I had the customer ground the rack
the 2801 was mounted into. Lastly TAC shipped me all brand new equipment
but the problem still persists after I swapped it out.

 

I'm running 12.3(14T) IOS. This customer has a second site with
identical hardware and IOS and is not experiencing the problem. 

 

It has to be the phone lines but the Telco says they are fine and since
I can plug a regular phone into the line and get no noise it is hard to
argue with them.

 

 

Thoughts?

 

 

 

 

Ryan O'Connell 

Senior Consultant CCIE Voice (13382)

 

NexInnovations Inc.

3636 - 23rd Street N.E.

Calgary, AB. T2E 8Z5

 

Desk (403) 291-7293

Cell: (403) 990-1275

Fax: (403) 291-7281

 

Ryan.OConnell at nexinnovations.com

http://www.nexinnovations.com <http://www.nexinnovations.com/> 

 

 

 

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