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Echo is heard in 7911 phones

Hi,

When the call is made by Cisco Ip phone 7911 big echo is being heard during the conversation by the caller. The same call made by Cisco IP phone 7960 is excellent. Call statistics for the two calls are:

7911      Avg Jitter 1   Max Jitter      30

7960      Avg Jitter 1   Max Jitter      5

The firmware version for the 7911 is SCCP11.8-4-2S. I search for bug in the firmware but i can not find nothing. What can be the problem?

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