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noise/hissing problem before ring-back-tone

hell.

i have a problem with noise/hissing problem before ring-back tone.

gateway(C2800) was connected with NEAX pbx system with Ei Trunk.

they were connected using no-CRC option.

whenever i make a call from one of pod to another pod, i can hear noise a short time before ring-back tone.

somethimes, the problem occured.

do you have any good idea to resolve it?

regard,

john.

2 REPLIES
Silver

Re: noise/hissing problem before ring-back-tone

Hissing and noise can be because of codec miss match or VAD, comfort noise etc,

Some of the problems and solutions are disscussed in below URL.

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a00800a9982.shtml

Can also do a BERT testing of the line or a loopback test for line noise.

http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a008010059a.shtml

Hi, I had the same issue with

Hi, I had the same issue with 2800 series router. 
In my case was an IOS problem and was fixed with a downgrade of IOS:

c2800nm-entservicesk9-mz.124-9.T.bin - original IOS with problem
c2800nm-ipvoice-mz.124-6.T.bin - IOS with no problem

 

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