OVERLOAD CONTROL FOR SESSION SETUPS

摘要

A centralised server system (12, 18) is arranged to monitor overload restriction requirements of session control nodes (21A-D) within a globally scalable VoIP and Multimedia network (20) in order to handle session set-up requests. An overload status module (38) in the server system receives overload status messages (22) from the session control nodes and based on these messages and the demand on each session control node determined from session set-up requests, the server system (12, 18) selects which session control nodes (21A-D) as well as which of their associated interconnects to other networks to include in a session setup response (6) to a session setup request (5) from a source session control node (21A-D).

主权项

1. A method for optimising session set-up between session control nodes providing services to different service provider networks via interconnect connections in a globally scalable VoIP network, said method comprising at a centralised server system:
receiving load status messages indicating a load status from session control nodes and storing the load status for each session control node, said load status messages comprising a required overload restriction for a session control node; receiving session set-up requests from said session control nodes where each session set-up request identifies a requesting session control node and a destination address and determining from said requests the number of session set-up requests directed to each destination session control node; for each received session set-up request selecting one or more session set-up policies to include in a response to the requesting session control node based on said indicated load status and the number of session set-up requests directed to each destination session control node, said session set-up policies indicating which destination session control edge nodes in the VoIP network, and their associated interconnects, serve each respective destination network; and sending the one or more selected session setup policies to the requesting session control node.