[Serusers] Echo Cancellation

[ravi reddy]

Hi users

          I noticed some strange thing yesterday when i made a SIP-SIP call
everytthing was O.K , when I made SIP-Pstn local call its pretty good BUT
When I made SIP-PSTN (international) I am Hearing my Voice back at Some
stages , I tried for lot of calls but i dont understand where actually the
problem is creating ,

                   Can any body please solve this "ECHO" problem
Thanks.

Regards,
Ravi.
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