[Asterisk-Users] DTMF feedthru again...

[Vahan Yerkanian]

Doug Crompton wrote:
> Two other Digium bug reports on this issue. It sure looks like it is an *
> issue and rather complex??? Any hope for a solution??
> 
> http://bugs.digium.com/view.php?id=5970
> http://bugs.digium.com/view.php?id=6027

It is an * issue, tested and confirmed. Makes any PSTN side IVR 
application unaccessible. It is there for the past 2 years. Current 
rfc2833 implementation in Asterisk requires a total rewrite to fix this. 
This issue was raised several times, with some answers being an attempt 
to challenge Sipura's own rfc2833 implementation validity or a promise 
to fix or submit-your-fix kind of answers. Several possible fixes were 
posted but never made it to the trunk. If you can leave * out of the 
path, you wont have any DTMF problems, as soon as * is in the voice 
path, the dtmf packet sequencing bug manifests itself.


You have a choice of disabling all codecs except alaw/ulaw and sticking 
to the inband dtmf option on both sipura and asterisk sides.

HTH,
Vahan