CMPhone with Nokia N82/E61

Finally it works after a lot of trials and errors! Below are the settings:

Menu > Tools > Settings > Connection > SIP settings
Profile name: CMPhone
Service profile: IETF
Default access point: [Your Access Point]
Public user name: sip:852xxxxxxxx@202.0.179.3
Use compression: No
Registration: Always on
Use security: No

Proxy server
Proxy server address: sip:202.0.179.3
Realm: huawai
User name: 852xxxxxxxx
Password: [Your Password]
Allow loose routing: No
Transport type: UDP
Port: 5060

Registrar server
Registrar server address: sip:202.0.179.3
Realm: huawai
User name: 852xxxxxxxx
Password: [Your Password]
Transport type: UDP
Port: 5060

Yeah! Next is to integrate the service into IP-based PABX.