asterisk users - Nov 2005 - Problem with IAX2 jitterbuffer and DTMF reception with 1.2.0

I've noticed that if I enable the jitterbuffer in iax.conf with Asterisk 
1.2.0 that Asterisk stops responding to incoming DTMF frames for calls 
between Teliax and my server.  I've used "iax2 debug" and Ethereal
to
confirm that Teliax is, in fact, sending the frames.

I only have two IAX2 connections (one a softphone on my local network 
and the Teliax registration).  The softphone does not experience the 
problem (DTMF frames sent from the softphone to * are recognized with 
the jitter buffer enabled).

Everything else about the connection with Teliax is fine when the jitter 
buffer is enabled.

"iax2 show channels" reports a 40 ms delay with the Teliax connection.

Any ideas?

My iax.conf is:

[general]
bandwidth=low
jitterbuffer=no  ; setting this to yes causes DTMF frames from Teliax to 
be ignored (for my server anyway), apparently
forcejitterbuffer=no


register => 
XXXXXXXXXXXXXXXXXX:XXXXXXXXXXX@voip-co3.teliax.com                 

tos=lowdelay
autokill=yes



[bboatrig]
type=friend
host=dynamic
context=default
auth=md5,rsa,plaintext
secret=XXXXXXXXXX
callerid="Laptop" <7020>
accountcode=bboatrig0

[teliax]
context=incoming-voip-trusted
type=friend
host=voip-co3.teliax.com
auth=md5
secret=XXXXXXXXXXXXXXXXXXXXX
disallow=all
allow=ulaw
allow=alaw
allow=gsm

> I've noticed that if I enable the jitterbuffer in iax.conf with
Asterisk
> 1.2.0 that Asterisk stops responding to incoming DTMF frames for calls 
> between Teliax and my server.  I've used "iax2 debug" and
Ethereal to
> confirm that Teliax is, in fact, sending the frames.
> 
> I only have two IAX2 connections (one a softphone on my local network 
> and the Teliax registration).  The softphone does not experience the 
> problem (DTMF frames sent from the softphone to * are recognized with 
> the jitter buffer enabled).
> 
> Everything else about the connection with Teliax is fine when the jitter 
> buffer is enabled.
> 
> "iax2 show channels" reports a 40 ms delay with the Teliax
connection.
> 
> Any ideas?
> 
> My iax.conf is:
> 
> [general]
> bandwidth=low
> jitterbuffer=no  ; setting this to yes causes DTMF frames from Teliax to 
> be ignored (for my server anyway), apparently
> forcejitterbuffer=no
> 
> 
> register => 
> XXXXXXXXXXXXXXXXXX:XXXXXXXXXXX@voip-co3.teliax.com                 
> 
> tos=lowdelay
> autokill=yes
> 
> 
> 
> [bboatrig]
> type=friend
> host=dynamic
> context=default
> auth=md5,rsa,plaintext
> secret=XXXXXXXXXX
> callerid="Laptop" <7020>
> accountcode=bboatrig0
> 
> [teliax]
> context=incoming-voip-trusted
> type=friend
> host=voip-co3.teliax.com
> auth=md5
> secret=XXXXXXXXXXXXXXXXXXXXX
> disallow=all
> allow=ulaw
> allow=alaw
> allow=gsm
Had the same issue with them for some time using cvs-head. I simply
left the jitterbuffer turned off and really haven't had an issue.

I opened a trouble ticket with them and they quickly blamed asterisk
for not fixing a problem. Best guess is they are running an older
version of iax2 (probably modified) and haven't taken the time to
upgrade.

There is also a known issue with using trunk=yes and ilbc. Bug has been
opened on that one.