What is particularly weird is that if I connect a call to Echo on my local server, I don;t usually get this oscillation, however if I connect it to Echo on another Asterisk server (over IAX), it does happen. The main difference will be the delay in the echo, as the software versions are within the last two days.
The Echo application is the same on both, and the call should be entirely digital so there should be no gain differences and there is no echo suppression on the IAX link, so it must be the local Zap echo canceller fighting with the apparently "longer" line? Peter -----Original Message----- From: Mike Benoit [mailto:[EMAIL PROTECTED] Sent: 28 June 2004 21:59 To: [EMAIL PROTECTED] Subject: Re: [Asterisk-Users] Zap X100P oscillation I wonder if your issue and mine are related somehow. I have a asterisk server with 4 FXO cards in it, and when a call comes in one ZAP channel, then dials out another, I hear what could be described as a steam engine starting up. It starts off kinda slower/ quiet, then quickly (in about 2-4 seconds) completely over powers the line. The only way I could stop it was by adjusting the gains. rxgain=-8.5 txgain=4 Seemed to do the trick. As did: rxgain=-6.5 txgain=1 An rxgain of even -8.0 or -6.0 in either case would result in this "steam engine" sound. -8.5 or -6.5 would make it go away completely. I'm using a CVS checkout from yesterday, and I tried with both echotraining=800 and turning echo cancellation off completely. Neither made any difference. It would be really nice to be able to use a positive rxgain value. I haven't tried with the echo app, but using just one FXO card works fine with almost any rx/txgain value. As soon as the call utilizes two FXO card at the same time, the "steam engine" sound occurs. On Mon, 2004-06-28 at 16:26 +0100, Whisker, Peter wrote: > Has anyone seen this problem before? > > I have a server with a single X100P card. The audio level is a low, but if I > raise the gain to more than -2db (Rx + Tx) it starts to oscillate in an echo > test. Not at a high frequency but with a noise that is best described as a > steam engine starting up. It then starts to clip and crackle. If I bring the > gain down to Rx=-2.0 and Tx=0.0 or lower then it settles down but it is very > very quiet. > > I have tried the latest CVS Head with echotraining=800 set and also complied > with the aggressive echo cancelling, but nothing seems to help. > > Ideas welcome! > > Many thanks > Peter Whisker > > This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you. > _______________________________________________ > 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 -- Mike Benoit <[EMAIL PROTECTED]> _______________________________________________ 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 This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you. _______________________________________________ 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 This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you. _______________________________________________ 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
