Truphone presents its interoperability with GTalk. A specific formatting of the GTalk contact address is required, while the user experience is quite the same as for SIP calls.

‘On-net’ Truphone users show as ‘online’ in Google Talk, enabling people to know exactly when they can make a free call. Calls between Google Talk and Truphone are free because they are pure VoIP calls and take place entirely over the internet. Communication between Google’s servers and Truphone’s servers is via the standard XMPP protocol.

The 5 minute’s video describes how calls can be placed.


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