1. Go to Tools/Settings/Connection/SIP settings.Create the following profile:

Profile Name
Profile
Access Point
Public username
Use Compression
Registration
Use Security
Proxy Server Address
Registrar Server
Realm
User name

aircelvoice
IETF Default
Your WLAN AP name
username@sip.aircelvoice.com
No
"Always on"
No
None
None
None
None

2. Enter the following for Registrar Server settings

Registrar Server
Realm
User name
Password
Transport Type
Port

sip.aircelvoice.com
sip.aircelvoice.com
aircelvoice username*
aircelvoice password*
UDP
5060

* Your existing aircelvoice username and password

3. Go to connection / Internet Tel. Settings

Create a new profile for "aircelvoice"(aircelvoice usernamexxx), name it "aircelvoice"
In Connectivity / Internet tel. / Preferred profile
Choose "aircelvoice"

4. Reboot your phone. Once your phone is back on, it will automatically register to aircelvoice. Once it is registered you can start making calls.