STEP 1

Profile: ByteIT
Service profile: IETF
Default access point: Select your wifi or gprs access point
Public user name: sip: your_userID@sip.bablio.com<your_userid>
Use compression: No
Registration: When Needed
Use security: No

STEP 2

Proxy server
Proxy server address: sip:sip.bablio.com
Realm: sip.bablio.com
User name: your_userID 
Password: your account password
Allow loose routing: Yes
Transport type: UDP
Port: 5060

STEP 3

Registrar server
Registrar serv.addr.: sip:sip.bablio.com
Realm: sip.bablio.com
User name: your_userID
Password: your account password
Transport type: UDP
Port: 5060

STEP 4

Make calls!