[Serusers] Re: Echo Cancellation

Evan Borgström evan.borgstrom at ca.mci.com
Mon Jul 10 16:52:20 CEST 2006

	Just because you're sending both calls through the same gateway doesn't
mean that your providers upstream gateways don't change depending on the
destination. Your provider could have tens or hundreds of different
vendors depending on where they terminate calls.

	Check the ECAN (echo cancellation), VAD (variable audio detection), etc
settings on your ATA or IP phone. Play with the gains (turing down the
tx gain on the microphone can help). Try changing codecs. Buy a book on
how PSTN audio works or speech codecs, do some google searches, there's
LOTS of info out there.


ravi reddy wrote:
> Thanks for your reply
>            Here both local calls and international calls are passing
> through same gateway but why iam hearing echo only for international calls
>                can you have any idea please suggest me
>              Thank You
> Regards,
> Ravi
> On 7/10/06, ravi reddy <mravikreddy at gmail.com> wrote:
>> 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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