On Mon, Feb 04, 2008 at 04:52:44PM -0500, Daniel Melnechuk wrote: > Bad news, DTMF after connection to PSTN is still not 100%. It does > work better as i was able to call into a conference call and checking > voicemail, but then checking the same voicemail system didn't work a > second time. So i would hazard that rfc2833 still needs some work. > > What is strange is that callweaver never has a problem with what is > dialed to it to start a call, just what is dialed out to the PSTN via > my sip provider. There is some evidence to suggest that when it > fails, it is every other digit that is being dropped. For instance, > after i called a voicemail system out on PSTN, when it asked for the > mailbox number and i put in 123-456-7890, the voicemail comes back > and says "2 4 6 8 0" is not a valid mailbox. Maybe this is a clue? > > What can i do to help solve this problem? Is there some trace, or > log, or something i can do on my end to help this along. I am a > systems, software, network engineer and would like to do my part to > help solve this for callweaver seeing as i am having the problem.
It sounds like jitter. RFC2833 tends not to do well if significant jitter is present. The latest trunk and 1.2 snapshots have some more attempts to work around problems but really it's down to the receiving side to deal with the jitter. If you use "rtp debug [ip <host>]" you'll should see the outgoing RFC2833 being clocked out at the right packet intervals (20ms normally). Tcpdump/wireshark will confirm. If the peer sends RTCP reports and you're using a latest build you'll also get the occasional report of what jitter the peer sees. If you use "sip debug" you might be able to figure out what software the peer uses. If it's open source you could then try and add better jitter handling to its RTP stack. Alternatively, use SIP INFO instead of RFC2833 if the peer supports it. That's outside the media stream, above the RTP and jitter tolerant. Mike -- Mike Jagdis Web: http://www.eris-associates.co.uk Eris Associates Limited Tel: +44 7780 608 368 Reading, England Fax: +44 118 926 6974 _______________________________________________ Callweaver-users mailing list [email protected] http://lists.callweaver.org/mailman/listinfo/callweaver-users
