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The wide scale deployment of Internet combined with several advancements in hardware and software technologies created opportunities for several Internet based applications such as Voice Over IP (VoIP) that involves the delivery of voice, video and data to the end user. SIP, the Session Initiation Protocol, is a signaling protocol for Internet conferencing, telephony, presence, events notification...
Session Initiation Protocol (SIP) is adopted as the main signaling protocol for the IP Multimedia Subsystem (IMS). Large deployment of SIP servers in Next Generation Networks (NGN) requires studying the behavior and performance of SIP servers under both normal and overload conditions, which may happen in such networks with a vast number of users. In this paper a measurement-based study is performed...
The session initiation protocol (SIP) is rapidly becoming the dominant signalling protocol for calls over the Internet. It has quickly made large inroads into the voice over IP (VoIP) market. SIP is an application-layer control operating on top of a transport protocol and allows to create, modify, and terminate sessions with one or more participants. With security considerations, these operations...
The SIP protocol provides authentication and authorization of SIP requests through a challenge-response authentication scheme inherited by the HTTP protocol and named HTTP Digest Authentication. The current specification defines a particular algorithm for calculating the challenge response that uses the MD5 hash of a combination of user name, realm, and password. Unfortunately, a lot of authentication...
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