SIP (Session Initiation Protocol) is a protocol used to establish, modify and terminate VOIP telephone calls. Using SIP, you can make cheap calls to a landline and regular mobile phones. With Nimbuzz SIP support, you can make Internet calls via the Nimbuzz Phonebook feature by adding any SIP provider you already use. Costs depend on your SIP provider rates.
SIP calling is mostly used to make cheap international calls.
You can go to Options > Settings > SIP Accounts to register an account.
After that you can place VoIP calls via the Phonebook.
User Fring if you want to make free calls. It works on Yahoo Messenger and Gtalk so you can call your buddies available on Yahoo! or Gtalk.
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