From Forum Nokia Wiki

ID	KIS000921	Creation date	April 30, 2008
Platform	S60 3rd Edition	Devices	All devices supporting VoIP
Category	Symbian C++	Subcategory	VoIP

Keywords (APIs, classes, methods, functions):

Description

Retrieving VoIP status information such as availability, profile, and protocol in use, and information about registered VoIP profiles is not possible with the public SDK APIs.

Solution

No solution available with the public SDK.