Here is another possible workaround for the DTMF problem:

Install Twinkle under Debian, or recompile it for Maemo. I tried DTMF with Twinkle in Debian and it works fine! Unfortunately, the VoIP audio in my Debian version does not work fine (too much latency). That makes Twinkle useless.

In Maemo the audio functions are accelerated by the DSP. I don't think happens in Debian, unfortunately. Twinkle is easy enough to install in Debian with "apt-get install twinkle." It's too bad that the audio doesn't work.

I'm going to try Twinkle under Debian as a chroot, maybe that will work better, as likely the only other alternative is a fresh Twinkle compile for Maemo in Scratchbox. Unfortunately I just don't have the time right now for Scratchbox. Maybe somebody else might be up to the challenge.

Also , a possible fix for me is if there is an easy way to remove the g729 codec from Internet Call, or at least make it a lower priority??? That would fix my situation. If anyone knows a way to do that your help would be greatly appreciated.