From Forum Nokia Wiki

ID	TSS000709	Creation date	July 4, 2007
Platform	S60 3rd Edition S60 3rd Edition, FP1	Devices
Category	Symbian C++	Subcategory	Networking

Keywords (APIs, classes, methods, functions):

Overview

Managing VoIP profiles

Description

S60 3rd Edition SDKs do not provide any APIs for adding, editing, or removing VoIP profile settings.

Solution

There are no APIs for VoIP profile management. VoIP profiles can be manually edited via the Settings application (Settings -> Connection -> Internet tel. settings).
Also, VoIP settings can be configured with OMA Client Provisioning. For more information, see the following Forum Nokia documents:
Client Provisioning Registration
OMA DM: Management Object for Nokia VoIP Implementation
as well as other information found at http://www.forum.nokia.com/main/resources/technologies/voice_over_IP/