[asterisk-users] DTMF Timing and Fujitsu F9600 Switch

[Will Szopko]

We're in the process of replacing an ancient Centigram-based, but
Fujitsu-labelled, voicemail system with an Asterisk solution. The system
will interface with a Fujitsu F9600 switch and use the SMDI module in
Asterisk 1.6.1.x to communicate the calling information needed to make the
interplay between the two systems work smoothly. This portion of the
project is configured and working fine, as is the programming in
extensions.conf. The SMDI work done by Russell at Digium came out really
well (thanks).

We are having one problem, though. That is, the DTMF interactions are not
working consistently from the Fujitsu to Asterisk (particularly the
sending of extension number and passcode). Sometimes the system will get
just a portion of the extension number or the password and hangup the call
before the entering is finished. Sometimes it will work fine, especially
if one "dials" slowly.

I have to figure that these problems are resulting from a discordance
between the DTMF timing settings on the Fujitsu and those on the Asterisk
box. However, I am unsure of how to figure out what settings to use. I can
certainly view the settings on the Fujitsu, but do not know of how to
"tune" the DAHDI settings on the Asterisk side. The options looked
limited. Or, conversely, what settings does Asterisk expect to see? If I
knew that, I could tune on the Fujitsu side of the equation.

BTW, the telephony hardware we are using is a Digium Wildcard AEX800 Board
1.

Thanks for any help any of you can provide.

- Will