[asterisk-dev] Clipped DTMF on Zap Channel - 1.4-r93000 - VLDTMF Incompatibility?

[Gregory Boehnlein]

> Now.. the system that is sending the SIP packets to the 1.4 box is an
> Asterisk 1.2 box. What I assume is happening is that the 1.2 system is
> sending the old style rapid fire DTMF events, and the Asterisk 1.4 box
> is processing them in the way that a sane RFC-2833 gateway would and
> starting  the DTMF, then immediately ending it upon receipt of the "end of
event"
> marker.
> 
> I can provide the Ztmonitor scans and packet traces if anyone likes..

As a side note, it works perfectly fine when using IAX2 instead of SIP;

[Dec 16 07:53:44] DTMF[3283]: channel.c:2378 __ast_read: DTMF end '1'
received on IAX2/tdm-1-7, duration 0 ms
[Dec 16 07:53:44] DTMF[3283]: channel.c:2414 __ast_read: DTMF begin
emulation of '1' with duration 100 queued on IAX2/tdm-1-7
[Dec 16 07:53:44] DTMF[3283]: channel.c:2498 __ast_read: DTMF end emulation
of '1' queued on IAX2/tdm-1-7
[Dec 16 07:53:44] DTMF[3283]: channel.c:2378 __ast_read: DTMF end '2'
received on IAX2/tdm-1-7, duration 0 ms
[Dec 16 07:53:44] DTMF[3283]: channel.c:2414 __ast_read: DTMF begin
emulation of '2' with duration 100 queued on IAX2/tdm-1-7
[Dec 16 07:53:44] DTMF[3283]: channel.c:2498 __ast_read: DTMF end emulation
of '2' queued on IAX2/tdm-1-7
[Dec 16 07:53:45] DTMF[3283]: channel.c:2378 __ast_read: DTMF end '5'
received on IAX2/tdm-1-7, duration 0 ms
[Dec 16 07:53:45] DTMF[3283]: channel.c:2414 __ast_read: DTMF begin
emulation of '5' with duration 100 queued on IAX2/tdm-1-7
[Dec 16 07:53:45] DTMF[3283]: channel.c:2498 __ast_read: DTMF end emulation
of '5' queued on IAX2/tdm-1-7
[Dec 16 07:53:45] DTMF[3283]: channel.c:2378 __ast_read: DTMF end '6'
received on IAX2/tdm-1-7, duration 0 ms
[Dec 16 07:53:45] DTMF[3283]: channel.c:2414 __ast_read: DTMF begin
emulation of '6' with duration 100 queued on IAX2/tdm-1-7
[Dec 16 07:53:45] DTMF[3283]: channel.c:2498 __ast_read: DTMF end emulation
of '6' queued on IAX2/tdm-1-7