The Session Initiation Protocol (SIP) has been used widely for Voice over IP (VoIP) service because of its potential advantages, economical efficiency and call setup simplicity. However, SIP-based VoIP service basically has two main security issues, malformed SIP message attack and SIP flooding attack. In this paper, we propose a novel mechanism for SIP-based VoIP system utilizing rule matching...

This document specifies a Session Initiation Protocol (SIP) profile of Security Assertion Markup Language (SAML) as well as a SAML SIP binding. The defined SIP SAML Profile composes with the mechanisms defined in the SIP Identity specification and satisfy requirements presented in "Trait-based Authorization Requirements for the Session Initiation Protocol (SIP)". Table of

As a result of its low costs and high degree of integration with other services, Voice over Internet Protocol (VoIP) has become very widely used, while Session Initiation Protocol (SIP) is one of the most important protocols for providing the VoIP service. Since SIP is an open source code with a simple structure and high expansibility, SIP servers are more vulnerable to attack by SIP messages m...

The Session Initiation Protocol (SIP) has been adopted by the IETF as the control protocol for creating, modifying and terminating multimedia sessions. Overload occurs in SIP networks when SIP servers have insufficient resources to handle received messages. Under overload, SIP networks may suffer from congestion collapse due to current ineffective SIP overload control mechanisms. This paper int...

Malformed SIP attacks are threatening the security of VoIP system, such as IP Multimedia Subsystem, which uses SIP (Session Initiation Protocol) as its core protocol. Though IDSs (Intrusion Detection System) supporting malformed SIP detection had been produced, it was not clear to what extent they can detect disguised malformed SIP messages. This paper analyzes the condition of SIP IDS evasion ...

Voice over IP (VoIP) services have become prevalent lately because of their potential advantages such as economic efficiency and useful features. Meanwhile, Session Initiation Protocol (SIP) is being widely used as a session protocol for the VoIP services. Many mobile VoIP applications have recently been launched, and they are becoming attractive targets for attackers to steal private informati...

Bare PC systems, which run applications without using any operating system (OS) or kernel, are immune to attacks targeting a specific OS. They also perform better than conventional systems due to their reduced overhead. We describe the design, implementation and performance of a SIP user agent (UA) for secure VoIP on a bare PC system. In particular, we discuss SIP functions and message handling...

The main aim of this study was to demonstrate that the surface immunogenic protein (Sip) of the aquatic pathogen Streptococcus agalactiae is a potential candidate for vaccine development for Oreochromis niloticus. In this study, a Sip was identified. Alignment analysis indicated that the Sip protein was highly homologous with Sip proteins from other S. agalactiae isolated from humans (99%). SDS...

Mobile ad hoc networks (MANETs) are of primary interest as new networks because of their flexibility. The Session Initiation Protocol (SIP) is the main signaling system in 3G and SIP servlets the main service provisioning framework. SIP is now being considered as a basis for signaling in MANETs. This makes the SIP servlets framework a chief candidate for service provisioning in MANETs. In this ...