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.
Chris -- Chris ---------------------------------- E Mail: [EMAIL PROTECTED] SIP: [EMAIL PROTECTED] IAXTEL: 17003366726 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
