Would it be possible here to make the echo canceler option (2,3, etc.) a configuration file setting, maybe in Zapata rather than compile time?
What does this do to system resources? - Brent > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:asterisk-users- > [EMAIL PROTECTED] On Behalf Of Stephen R. Besch > Sent: Tuesday, February 17, 2004 11:05 AM > To: [EMAIL PROTECTED] > Subject: [Asterisk-Users] Re: X100P / Echo / ZTMONITOR CAN2,3, etc. > > Andrew Kohlsmith wrote: > >>If you're getting echo of your own voice, but the remote is getting a > >>clear signal, then Asterisk echo cancellation is working properly. It > >>is the remote provider not echo cancelling properly. > > > > > > I don't buy it. If that were the case then why would I not _also_ get > my > > own voice echoed with a regular phone plugged in to the same POTS line? > > > And you shouldn't! Theory holds that exactly the opposite is true. With > no echo cancellation at all and with an unbalanced hybrid, the local > party hears the echo and the remote party does not. This is because the > local hybrid listens to itself talking to the pots line and sends what > it hears back to the local listener. If the hybrid is perfectly > balanced, it will subtract out what it is saying to the pots line before > it returns the signal to the local caller. The problem is that it rarely > does a very good job of this. Neither do many commercial channel banks. > > There are a few common hardware glitches that can make echo a lot worse, > such as a shorted leg or corroded connection in the PSTN wiring, having > a hard wired extension connected to the same line or simply having a > lousy CO switch at the other end. The first 2 the phone provider should > diagnose and fix for you. > > The strange thing here is that asterisk is not removing the echo. I did > notice that the 0.7.1 tar did not do the echo cancel very well and Mark > suggested that I go back to the CVS, which did wonders. You might also > verify that echo cancellation is actually turned on. Enter "zap show > channel x" at the CLI, where x is one of your defined zap channels. If > it's enabled, somewhere in the output you should see "Echo Cancellation: > xx taps, Currently On/Off". The On/Off will change from Off to On when a > call is bridged. If it is not enabled, check the definitions in zapata > and in your make file. > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users