Patent ID: 8345581

Claim:
A method of authorising a user of a communication system to be added to a group communication event comprising: selecting, at a host node on a first user terminal, a group of users of the communication system, the first user terminal being associated with a user who is a member of the group of users; initiating, from the host node, the group communication event with the group of users; responsive to receiving a group communication acceptance from at least a first user in the group, establishing, using the host node, the group communication event with the first user in the group; using the host node, enabling display of, in a user interface of a client configured to execute at a user terminal associated with the at least first user of said group of users, the identity of each member of the group communication event in response to receiving a notification of the group communication event; receiving, at the host node and from another user of the communication system during the group communication event, a communication set up request associated with a communication event; analysing the communication set up request effective to determine if said another user is a member of said group of users associated with said group communication event initiated by the host node; responsive to determining said another user is a member of said group of users associated with said group communication event, determining whether the communication set up request indicates said another user requests to join said group communication event; responsive to determining that said another user is a member of said group of users and requests to join said group communication event, adding said another user to the group communication event, and displaying the identity of said another user in said user interface; responsive to determining that said another user is a member of said group of users associated with said group communication event and said another user does not request to join said group communication, rejecting the communication set up request from said another user; and responsive to determining that said another user is not a member of said group of users associated with said group communication event, rejecting the communication set up request from said another user.