Mobile ad-hoc network (MANET) can be defined as a network that is dynamically formed from randomly located mobile devices. SIP protocol allows two remote parties to initiate a call using centralized entities such as a proxy and location registrar. In order to enable the usage of an inherently centralized protocol such as SIP over a distributed environment such as MANET a lot of adaptation should be considered. This paper presents FCSIP, an adapted and semi distributed SIP protocol that works over clustered MANET. FCSIP allows MANET cluster-heads to play the role of SIP discovery servers which can then coordinate their work to allow a SIP client user agent to get the information of another client in order to initiate a call between the two parties. Results of comparing FCSIP with a fully distributed version of SIP shows a considerable improvement achieved by FCSIP regarding the overhead of control messages and the success ratio of SIP queries.
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