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Mobile Information Systems
Volume 3 (2007), Issue 3-4, Pages 165-185

Mobile P2P Web Services Using SIP

Guido Gehlen, Fahad Aijaz, Yi Zhu, and Bernhard Walke

RWTH Aachen University, Faculty 6, Communication Networks, Kopernikusstr. 16, 52074 Aachen, Germany

Received 15 October 2007; Accepted 15 October 2007

Copyright © 2007 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Telecommunication networks and the Internet are growing together. Peer-to-Peer (P2P) services which are originally offered by network providers, like telephony and messaging, are provided through VoIP and Instant Messaging (IM) by Internet service providers, too. The IP Multimedia Subsystem (IMS) is the answer of the telecommunication industry to this trend and aims at providing Internet P2P and multimedia services controlled by the network operators. The IMS provides mobility and session management as well as message routing, security, and billing.