In Qtopia Phone Edition 2.2.0 which version of KPhone can be used with VoIP?

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Answer:

Qtopia has been tested and verified with KPhone 4.1 only.

A sample SIP stack and VoIP user agent is found in $QPEDIR/src/3rdparty/applications/kphone.

This sample is suitable for demonstration purposes only and should not be used on a production device.

The Qtopia communication protocol for supporting VoIP is found in the source file $QPEDIR/src/libraries/qtopiaphone/voipline.cpp and can be used as a guide for implementing the protocol.