A SIP Message Overload Transfer Scheme

As SIP is more and more used in IMS network as a session signaling protocol, certain nodes on the signaling layer have to process a large number of SIP messages. Chances are that disruptions may be caused in them by extremely high volume of messages. This paper introduces a concept for efficient SIP message routing and user assignment. The SIP message overload transfer scheme is defined that has two major advantages over existing persistent hash routing. The content or user location in the scheme is arbitrary and it provides overload and backup routing capabilities.