Extract and install the SIS file using the Nokia Suite software on your computer or handset.
When the installation is complete you will see the "SIP VoIP Settings" application under the Applications, you will need it on the STEP 5 of this tutorial in order to enable better voice quality.
Go to Tools > Settings > Connection > SIP settings.
Choose Options > New SIP Profile and create the following profile;
Profile Name: Switch2Voip Service
Profile: IETF Default
Access point: (your WLAN AP name)
Use Compression: No
Registration: "Always on "
Use Security: No
Proxy Server Address: none
User Name: none
Enter the following for Registrar Server settings
Registrar Server: sip.switch2voip.us
User Name: XXXXXXXX (replace XXXXXXXX for your account number, use the account number assigned to you when signed up for Switch2Voip)
Password: Enter your Switch2Voip password
Transport Type: UDP
Go to Tools > Settings > Connection > Internet Tel. Settings (If you cannot find it check Settings > Connectivity > Admin Settings ? Net Settings)
Create a new profile for "switch2voip"(XXXXXXXX), name it "switch2voip"
Choose "switch2voip" as Preferred profile
For better voice quality or in order to be able to make VoIP calls over 3G internet connection you need to use Nokia SIP VoIP Application you installed.
Go to Applications on your phone and click on "SIP VoIP Settings" application. Choose VoIP services/Switch2Voip (or the name of your Switch2Voip account Internet profile.)
Click on "Profile Settings" and find "Allow VoIP over WCDMA" option and change it to "ON" This change allows VoIP over 3G connection on Nokia phones.
For better voice quality go to Codecs and delete all codecs except G729. There should be only G729 codec left under codecs settings
Reboot your phone. Once your phone is back on it will automatically register to Switch2Voip.
Once it is registered you can start making calls.
Default call type: To switch between n ormal GSM calls or VOIP calls, navigate to Tools > Settings > Call > Default call type. Select Cellular to make normal calls to the phone number or Internet to use VoIP to call the number or address
To dial any phone number that is part of the NANP (North American Numbering Plan), you must dial: