Open: Address book -> Personal info -> Accounts.
Create new SIP account:
User name: Your_Account_Id@sip.diamondcard.us Password: Your_PIN_code
Use for telephone numbers: checked User name: Your_Account_Id Transport: UDP Outbound proxy: sip.diamondcard.us Port: 5060 Discover public address: checked Loose routing: checked Keep-alive mechanism: Auto Keep-alive period: Auto Auto-detect STUN: checked