vgetty -> Zyxel I2864 does not detect dtmf while waiting

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Hi!

At the moment, Im having a Zyxel I2864 with firmware 2.99i. Im trying to
get a little voicebox to work. But, with this zyxel, i cannot detect
dtmf tones while waiting. While playing, everything workes. I tried to
change the 'dtmf_threshold' value in voice.conf. Didnt really work.
Sometimes it found a fax calling tone, but no dialtones.

Because of all this, im not shure, if i should get an other ISDN modem.
The problem is, I dont know, which one works fine, which does not and I
need an ISDN Modem which supports Caller_ID and Caller_NR.
So I wanted to ask you all, what ISDN modems would work fine. Is the
"ELSA MicroLink ISDN/TLV.34" a good choice? Is there something better?
Or do you think the Zyxel I2864 is the best choice and I should play a
void sound file to simulate waiting?

thanks for help
-silvan