Comprehensive Comparison of VoIP SIP Protocol Problems and Cisco VoIP System

Securing SIP in VoIP Domain

Securing SIP in VoIP Domain

Voice service is vulnerable to a number of attacks that can compromise the confidentiality, integrity and authenticity of voice communication. As a result, this paper proposes a security protocol that protects these security aspects of voice service. The proposed security protocol identifies the security roles of the different components within VoIP domain applying SIP as the signalling protoco...

An improved Authentication Protocol for SIP-based VoIP

The SIP being an application layer protocol for signaling has been considered as the most appropriate one for multimedia applications. In order to detect some collisions and replay attacks, the SIP offers built-in authentication mechanism as per its specification, designated as HTTP digest based authentication, but study reveals that it is vulnerably susceptible to heterogeneous security issues...

SOSIMPLE: A SIP/SIMPLE Based P2P VoIP and IM System

Voice over IP (VoIP) and Instant Messaging (IM) systems to date have been either highly centralized or non-standard in nature. SOSIMPLE is a fully decentralized, standards-based P2P communications systems that reuses existing clients. This design is based on currently available open-source software. In this paper we address the challenges of developing a distributed messaging system that preser...

SIP and H . 323 — interworking VoIP networks

H.323 is currently the industry’s predominant standard for offering multimedia services over IP networks, although the session initiation protocol (SIP) continues to generate significant interest in the market-place for rendezvous-based real-time applications. With its greater maturity, H.323-based equipment continues to be deployed in operational networks. However, with the advent of SIP-based...