On Aug 6, 2008, at 8:30 PM, Ilan Perez wrote:

Two problems occur.
1.       There is no DTMF recognition

Sounds like they are doing inband DTMF.

2.       If I hangup during the playback the system still plays out the whole IVR

Sounds like you have NAT involved and maybe the Bye isn't received?

/b