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Journal of Computer Networks and Communications
Volume 2014, Article ID 352071, 11 pages
http://dx.doi.org/10.1155/2014/352071
Research Article

A Mechanically Proved and an Incremental Development of the Session Initiation Protocol INVITE Transaction

LMPHE laboratory, Faculty of sciences, University of Mohammed V, 4 Street Ibn Batouta, PB 1014 RP Rabat, Morocco

Received 31 May 2014; Revised 25 September 2014; Accepted 19 October 2014; Published 19 November 2014

Academic Editor: Kyandoghere Kyamakya

Copyright © 2014 Rajaa Filali and Mohamed Bouhdadi. 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.

Abstract

The Session Initiation Protocol (SIP) is an application layer signaling protocol used to create, manage, and terminate sessions in an IP based network. SIP is considered as a transactional protocol. There are two main SIP transactions, the INVITE transaction and the non-INVITE transaction. The SIP INVITE transaction specification is described in an informal way in Request for Comments (RFC) 3261 and modified in RFC 6026. In this paper we focus on the INVITE transaction of SIP, over reliable and unreliable transport mediums, which is used to initiate a session. In order to ensure the correctness of SIP, the INVITE transaction is modeled and verified using event-B method and its Rodin platform. The Event-B refinement concept allows an incremental development by defining the studied system at different levels of abstraction, and Rodin discharges almost all proof obligations at each level. This interaction between modeling and proving reduces the complexity and helps in assuring that the INVITE transaction SIP specification is correct, unambiguous, and easy to understand.