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The convergence of Voice and Data networks has changed the rudiments of telecommunication. With the spread of Cellular networks, convergence of voice, data, and cellular network is envisaged allowing users to seamlessly access services across networks while on the move. In this paper the authors discuss problems related to "Presence" in a converged network. A key issue in presence is to trace a user correctly and consistently. In a SIP (Session Initiation Protocol) based IP telephony network the presence information is kept as "Registration" bindings. They propose to use an alert mechanism, similar to paging in mobile network to notify the user of expired SIP registrations, so that the device/user can update the registration bindings.
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