asterisk users - Aug 2004 - Problem with grandstream devices and DTMF signalling

Hi,
I've got a problem with some grandstram devices (namely a couple of 
budgetone 101 and an ata-486). The point is that, unless I use inband 
for DTMF, asterisk ignore the first digit dialed. Inband DTMF forces me 
to use A-law/Mu-law, which is not what I want.

BTW, this appens after a Playtones(), waiting for user entering an 
extension.
I've tried many solutions, played around with all dtmf options...but no 
luck...


Note that after the first digit (which get 'lost'), others get processed
successfully.

Cheers,
Simone.


-- 
___________________________________________
Simone Ricci
E-mail: simone.ricci@cwnet.it
CWNET s.r.l.
http://www.cheapnet.it
___________________________________________

> Hi,
> I've got a problem with some grandstram devices (namely a couple of
> budgetone 101 and an ata-486). The point is that, unless I use inband
> for DTMF, asterisk ignore the first digit dialed.
Which firmware do you have?  Does the one from 
www.grandstream.com/BETATEST/ help you?

Grandstream used to send different SIP messages with the same CSEQ number 
when using early-dial. I reported this bug to them and they fixed it. 
Before it was fixed, I had the same effect you have: DTMF was only 
working inband, but not with RFC2833 or SIP-INFO.

Maybe there is some similar bug left when not using early-dial. You can 
find this out quite easily by using ethereal. If it is this bug AND the 
new firmware doesn't help, then you should try the attached patch.
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