Thanks, in my case though it looks like the originating party (polycom softphone) is hearing a clipped voicemail prompt because of that; should I look into having that fixed into their firmware? As a workaround, I was thinking to just add a few seconds delay in app_voicemail, or wait through AGI before calling voicemail, makes sense?
> Date: Wed, 1 Oct 2008 15:43:37 +0100 > From: [EMAIL PROTECTED] > To: [email protected] > Subject: Re: [asterisk-users] RTP sent before the INVITE ACK (for voicemail > app) > > > > > CLI output does not show any error that I see. Is there any reason other > > than a SIP 183 that would trigger this and isn't asterisk supposed to > > ACK/answer the channel before playing any prompt? > > > > Asterisk wil start the audio as soon as it sends back the 200 Ok > response it doesn't wait for the ACK. Most SIP servers will work like > that. The matching of ACK requests to a SIP transaction is not a > particulalrly robust mechanism (for instance if a user agent puts its > IP address in the Call-ID and a SIP ALG fiddles with the SIP packet > for INVITEs but ignores ACKs then there will be a mismatch. This > happens more frequently then you would think) so sending RTP after an > OK response is the correct thing to do. > > I think Asterisk will actually cut off the call after 32s if it > doesn't get an ACK which is not such a great idea but that may have > been changed in later versions. The arrival of an RTP packet from the > remote end should be used as the definitive indication of an answered > call not the ACK. > > Regards, > > Greyman. > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > AstriCon 2008 - September 22 - 25 Phoenix, Arizona > Register Now: http://www.astricon.net > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users
_______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
