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m
New Member

Echo problem

IP phone user hears an echo of his voice on a call to a PSTN phone. It looks like an issue with the voice gateway. Checked the cisco document

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml

Set the echo canceller converge to the highest value (64ms). But the users are still experiencing echo problems.

Attached pls find the output of "show voice active".

IOS 12.4.6T on Cisco 2811

Appreciate any input.

2 REPLIES
m
New Member

Re: Echo problem

!

voice-port 0/0/0:15

input gain -3

output attenuation 3

cptone AU

!

New Member

Re: Echo problem

There is a known bug with that version of IOS and the DSPs on it...bug CSCsd54344

DSP: Persistent echo heard on c5510 DSPs with 4.4.13 DSPware or higher

http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCsd54344

use show voice dsp group all to see if it is using DSP version 4.4.708. If it is you either need to go up to 12.4.9T (first fixed version) or downgrade the DSP (easiest option) to version 4.4.706.

You can call TAC about getting that file if needed.

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