On Thu, Jun 24, 2004 at 01:45:55PM +0100, Chris Glover wrote: > Hi, > > I've noticed the same thing with my 7960 running SIP 7.1. I came to the > conclusion that the Cisco does some clever echo cancellation, and that > pause is the echo canceller training. I don't think it's an Asterisk > problem. My Grandstream 101 works perfectly.
I had thought that it might be the echo canceller too... but of 400 calls today, I've had less than 20 reports of it occurring. Some only 2 seconds of silence, most around 5 to 6 seconds and a few over 20 seconds. I would have thought that's an awful long time for an echo canceller and fairly inconsistent. Or perhaps that's normal for echo cancellers? - Sam > On Thu, 24 Jun 2004, Sam Tilders wrote: > > > Hi, > > > > Despite much searching, I can't find anything quite like the problem > > we seem to be experiencing with our recently activated asterisk pbx. > > > > Of four people answering several calls per five minutes, I > > have reports of the occasional call starting with dead air. > > > > The user picks up the call from the queue, and they can hear that the line > > is too quiet. If they start talking, the caller either doesn't > > hear them, or only hears the end of the first sentence. > > > > Reports are that this silence at the start of the call lasts > > from 4-5 seconds, sometimes over 10 seconds and more rarely over > > 20 seconds. > > > > After the period of silence the call proceeds with no further problems. > > > > I have taken packet dumps of extended periods, there is nothing consistently > > different about the calls with silent start compared to those without the > > problem. The SIP INVITE is sent to the phone, the phone rings, and OK's the > > call. The RTP stream begins straight away. > > > > I'm using cvs-head as of 2004-06-10, CVS-D2004.06.09.14.00.00, recently > > updated from v1-0_stable dated a few weeks before. This problem > > existed with both versions. > > > > The phones are Cisco 7960's with SIP image 6.3, the calls are incoming > > on an E1 connected to a TE410P. Calls are queued and the phones > > statically defined as agents in the queue which has a ringall > > strategy. There is no queue announcement played to the answering user. > > > > Asterisk in vvv verbose doesn't log anything different when this occurs. > > > > So, has anyone else heard of something like this? Or have a suggestion > > for further investigation? > > > > Cheers. > > > _______________________________________________ > 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 > -- -- Sam Tilders [EMAIL PROTECTED] (Move to Jupiter) _______________________________________________ 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
