January 13, 2005
SIP, the technical standards that enable mobile presence
A traveler hears a unique ringtone on his cell phone, checks the screen and finds a presence notification that a colleague is awaiting a plane in the same airport. A teenager who just wrecked his mom's car checks the family presence channel on his mobile phone to find out his mother's current mood.
These examples hint at how presence technologies will enable services not achievable on existing mobile networks, explains Robert Sparks.
Presence technologies, like instant messaging, already have revolutionized how and when ‘buddies' communicate. But the technology is not limited to IM. Through standard-setting work by the Internet Engineering Task Force (IETF), presence has largely worked its way into voice over IP (VoIP) through extensions of the Session Initiation Protocol (SIP), which has become the global standard for VoIP call set-up and tear-down. This work has been adopted as a core technology by the 3rd Generation Partnership Project (3GPP), a consortium of wireless standards bodies defining the evolution of the GSM technologies.
As a result, mobile network users will gain instant knowledge of who is available, what they're doing and even their mood at the present time. Further, this standards work will bring presence into the realm of wireless/wireline convergence, affording anytime access to personalized applications and information over any network, via any device. (via SmartMobs)
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