thanks for your writing the network is like behind: Sip phone(caller)--->SER---->Asterisk----> world telephone carrier--->pstn-->callee
the carriers and their routers are not accessible for us , the callees have not any echo in their callings but the caller(sip phones) has the echo. there isn't any telephone cards on our servers(SER and Asterisk) , all of calls are come from or going out , on internet connections --- On Thu, 11/20/08, Alan Lord <[EMAIL PROTECTED]> wrote: From: Alan Lord <[EMAIL PROTECTED]> Subject: Re: [asterisk-users] echo cancellation for sip phones To: [email protected] Date: Thursday, November 20, 2008, 12:01 PM Pezhman Lali wrote: > Dear, > the sip phones that registered, in to the asterisk 1.4.x have the echo > in their callings to pstn. > how this echo can be canceled? Hmmmm - you don't give much to go on... What is the connection to the PSTN (i.e. what kind of card, interface etc...) The echo is almost certainly coming from that area rather than the SIP phones themselves. If you have an analogue PSTN card without h/w echo cancellation, I would suggest trying the OSLEC echo canceller. This is[was?] not installed by default with the zaptel drivers. HTH Alan _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
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