Session Initiation Protocol (SIP)
Android 2.3 (Gingerbread) introduced new features to support SIP, in the android.net.sip package. SIP is an IETF standard for orchestrating the sending of voice and video over a network connection to link people together in calls. This technology is sometimes called Voice over IP (VoIP), but note that there is more than one way to do VoIP. Skype for instance, uses a proprietary protocol to do VoIP and is incompatible with SIP. SIP also is not the same as Google Voice. Google Voice does not (as of this writing) support SIP directly, although there are ways to integrate Google Voice with a SIP provider to tie things together. Google Voice sets up a new telephone number for you that you can then connect with other ...
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