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Restoring CSCF by Leveraging Feature of Retransmission Mechanism in Session Initiation Protocol

Authors:
Takeshi Usui
Yoshinori Kitatsuji
Hidetoshi Yokota
Nozomu Nishinaga

Keywords: IMS; SIP; Network Operation

Abstract:
The IP multimedia subsystem (IMS) is a key technology for providing various services over IP-based networks. IMS enables network service providers to collect information relating to the communications of customers, such as an accounting through call/session control function (CSCF) which is used to establish a session using the session initiation protocol (SIP). Therefore, the availability of CSCF has become important. We propose a system to recover the session states maintained by the CSCF in the alternate CSCFs. This is achieved in a low cost solution by leveraging the features of retransmission mechanism in SIP. Our proposed system selectively saves the session state in order to reduce the saved data and recovers the saved session state in the alternate CSCFs rapidly when the faults occur in CSCFs. We show that our proposed system can achieve 60% reduction of the backup servers and that the overhead of our proposed system is not large.

Pages: 50 to 56

Copyright: Copyright (c) The Government of Japan, 2011. Used by permission to IARIA.

Publication date: November 20, 2011

Published in: conference

ISSN: 2326-9383

ISBN: 978-1-61208-174-8

Location: Lisbon, Portugal

Dates: from November 20, 2011 to November 25, 2011