On Wed, 2008-04-02 at 20:15 -0400, Gregory Boehnlein wrote: > > > This was only true with Asterisk up to and including 1.2; 1.4 and > > beyond > > > send proper RFC2833 (now RFC4833) DTMF telephone-events and > > > interoperability has been dramatically improved. > > > > my patch was for 1.4 so that is not true. > > What specifically does the 1.4 DTMF implementation break in terms of the > RFC? RFC-2833 is pretty vague about a lot of things, and most vendors > implementations (Cisco, Avaya, Sonus etc..) can be deemed to be "in > violation" of the RFC. For example Cisco doesn't respect DTMF duration > events, and clips DTMF upon receipt of a DTMF "end of event" marker. > Technically this violates the RFC. > duration per the rfc is optional, recommended for pstn gateways, but optional.
But aside from that there are issues, some of them such as the one I will say here (only becuase its been a couple months and I dont recall everything that I did, although it was all very obvious stuff if you look at it with a packet sniffer such as wireshark). RTP timestamps dont match, they are just plain wrong infact (1.4.15 was what I did this in, yes rtp is rfc1889 but this is in the 2833 generation code and only happens when it generates a 2833 packet, so its clumped together with the other things I fixed). At the time I gave oej a full list via irc, he made some comment on the bug issue and I kinda left it alone. I think there were 3-4 things fixed, this is either 25% or 33% of it, I just dont recall right now. > In a lot of ways, the Asterisk RFC-2833 implementation is more compatible > (in 1.4) than most other stacks out there. That may be, however it doesnt mean that its compliant :) -- Trixter http://www.0xdecafbad.com Bret McDanel Belfast +44 28 9099 6461 US +1 516 687 5200 http://www.trxtel.com the phone company that pays you! _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
