I use the latest Skype 2.2.0.20 for WM. The normal version for CPU >400MHz has no problem with DMTF. There is also DMTF playback when the keypad is pressed.
However, on the low CPU version the DMTF is not working. There is *NO DMTF playback when keypad is pressed. Here's the my hardware config:
Pharos GPS525+ (HTC Galaxy) Samsung S3C 300MHz. I tried both normal and low-CPU version on this one.
Dopod 818Pro (HTC Prophet) with QTEK AKU2.2 WWE ROM TI OMAP 195MHz. I only tried the low-CPU version on this one. I will try the normal version with DisableCodecs reghack.