On Wed, 2005-11-02 at 22:28 -0800, Kris Boutilier wrote: > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Ben Kramer > > Sent: Wednesday, November 02, 2005 3:37 PM > > To: [email protected] > > Subject: [Asterisk-Dev] echo, delay and dropped packets in > > channel driver > > > > > > heya, > > > {clip} > > > > A decided to try and record the echo being heard, so added a > > Monitor() command to the demo extens. What I see in the > > record files is no echo, but I often see 20/40/60/80 ms gaps > > of silence in both the in and out files. > > > > There is an issue present in both the mec2 and kb1 echo cancellers in > zaptel related to the echo can algorithm going a little nuts when it > gets a burst of '0' level samples. Similarly it also behaves poorly in > the presence of sustained very high signal levels. That being the case, > the echo artifacts you're hearing may be a symptom of the gaps in the > returning data coming in off of the pstn causing the can to generate, > rather than supress, echos. > > The MG2 canceller submitted by mgernoth (which is available for > evaluation right now - see http://bugs.digium.com/view.php?id=5520) > contains modifications specifically to fix these abhorrent behaviours. > Using it instead may aleviate the echo issues, though it won't remedy > the underlying problem.
Actually, as its not a zaptel card, so it doesnt use the zaptel echo cancellors. What I am trying to work out is the cause of the delay when chan_vpb interacts with the ast bridge functions. Cheers, Ben. > > Hope that helps. > > Kris Boutilier > Information Services Coordinator > Sunshine Coast Regional District > _______________________________________________ > Asterisk-Dev mailing list > [email protected] > http://lists.digium.com/mailman/listinfo/asterisk-dev > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-dev > _______________________________________________ Asterisk-Dev mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-dev To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-dev
