Patent ID: 7436841
Filing Date: 2008-10-14
Classification: H04L

Abstract:
1. A method for tracking a registration status of one or more users in a communication network according to H.323 or SIP standard, said users associated to a Gatekeeper (GK) administrating registrations and unregistrations of said users, each user accessing the communication network through an associated EndPoint of the communication network, the method comprising: sending a first message from said Gatekeeper to a Presence Application Server (PAS) which holds a presence list for each of the users for tracking user registration status, each time one of the users changes registration status in the communication network, wherein a first user is included in a presence list corresponding to a second user, said first message includes a user identification of the current user, a Gatekeeper identification, and the change of registration status for said user, returning, from said PAS to said GK, a URL pointing to the presence list of said user, updating presence lists affected by the change of the registration status of said user accordingly, sending, from said PAS, a second message to the Gatekeeper notifying the Gatekeeper about the updating.