Session control using a multicast address

Details Session control using a multicast address Session control using a multicast address

2004-06-17

2008-11-18

Nguyen, Steven H. D (Department: 2619)

Multiplex communications

Special services

Distribution of signal to multiple agent stations

C370S312000, C370S338000

Reexamination Certificate

active

07453831

ABSTRACT:
A method (800, 900) and apparatus (1001) for controlling a session between communication units (141-146) sharing a group Internet Protocol (IP) multicast address. The method includes determining communication units from which a response to a session initiation protocol (SIP) control message is not required and preparing the control message which is sent to the communication units using the group address with information used to control from which of the of communication units the response is required. The SIP control message is sent to a second communication unit using a unicast address indicating that the response is required.

REFERENCES:
patent: 6798755 (2004-09-01), Lillie et al.
patent: 2004/0087320 (2004-05-01), Kim et al.
patent: 2004/0180675 (2004-09-01), Choi et al.
J. Rosenberg, H. Schulzrine, G. Camarillo, A. Johnston, J. Peterson, R. Sparke, M. Handley, E. Schooler; “SIP: Session Initiation Protocol”; Section 2; pp. 9-10, Jun. 2002.
J. Rosenberg, H. Schulzrine, G. Camarillo, A. Johnston, J. Peterson, R. Sparke, M. Handley, E. Schooler; “SIP: Session Initiation Protocol”; Section 10.2.6; p. 62, Jun. 2002.

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