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Ad-hoc networks constitute a peculiar computing environment, characterized by the lack of centralized support from pre-existing network entities. Applications and protocols designed for centralized environments must be adapted for use in ad-hoc environments. For example, the baseline Session Initiation Protocol (SIP) strongly relies on the presence of an infrastructure, the SIP servers, and cannot therefore be deployed as it is in ad-hoc networks. This paper proposes a solution that enables devices in ad hoc networks to use SIP functionalities in a decentralized way. Particularly, the authors embed a limited set of SIP server functionalities in the end devices to allow distribute session management for SIP end devices, without network support.
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