WM6VoIPFull
Requirements: WM 6.x based phone or PDA
Overview: VoIP is already build in your WM 6.x based phone and you don't need some tird party software in order to make and receive VoIP calls using WiFi or 3G. WM6VoIPFull.cap just add two VoIP config programs + today screen plugin + the GSM VoIP codec.
Features:
* All outgoing / incomming calls are made using the standart build in phone dialer and address book
* If you like you can activate / deactivate the VoIP temporarily for some outgoing calls and etc
* The SIP VoIP build in WM 6.x supports only
GSM (13.2 kbps) / g711alaw (64 kbps) / g711-ulaw (64 kbps) codecs
Download: Full install. Freeware.
Here