[asterisk-users] DTMF not recognized on ISDN with Siemens -not IP- phone

Paul Hales pdhales at optusnet.com.au
Wed Nov 28 17:13:13 CST 2007

The current Digium BRI cards need the phones to send DTMF over as
Not sure why, but googling should help. (I think this is even covered on
the Digium site)


On Wed, 2007-11-28 at 09:47 +0100, Administrator TOOTAI wrote:
> Good day all,
> we have following setup: Debian Etch 64, Asterisk SVN-branch-1.4-r66244 
> with mISDN 1.1.3 and 2 Digium cards B410P. Our customers calls in the 
> office through ISDN lines and then get a possibility to join meetme 
> conference. It works well except when customers are using SIEMENS phones 
> (not IP): DTMF is not recognized.
> Does someone have an idea on what could be the problem with those phones?
> Thanks for any help

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