The Session Initiation Protocol is increasingly used as a signaling protocol for administrating VoIP phone calls. Careless configuration of the SIP protocol is known to lead to a large set of attacks. SIP can be configured in several ways so that different functional and security requirements are met. Tools exist for attacking Voice over IP protocols, yet most tools target the message traffic as-

This document describes how the IPv4 Session Initiation Protocol (SIP) user agents can communicate with IPv6 SIP user agents (and vice versa) at the signaling layer as well as exchange media once the session has been successfully set up. Both singleand dual-stack (i.e., IPv4-only and IPv4/IPv6) user agents are considered.

Ubiquitous worldwide broadband Internet access as well the coming of age of VoIP technology have made Voice-over-IP an increasingly attractive and useful network application. Currently the “human-readable” Session Initiation Protocol (SIP) which is based on a simple HTTP-like request/response exchange is steadily gaining headway against the considerably more complex ASN.1 encoded H.323 Multimed...

The Session Initiation Protocol (SIP) is a general protocol for session setup and management, e.g., for VoIP. Current SIP networks build on a fixed infrastructure that relies on static network entities. General problems with this infrastructure, e.g., in ubiquitous ad-hoc networks, lead to a trend of integrating peer-to-peer mechanisms into SIP. We propose a generic architecture for decentralis...

Session Initiation Protocol (SIP) has been extended by IETF SIMPLE Working Group to enhance the basic protocol with Instant Messaging and Presence functionalities. These extensions are, however, dependent on the Internet and SIP infrastructure. Ad hoc networks being devoid of any such infrastructure, require auxiliary mechanisms to support such extensions. In this paper, we present a brief over...

There are currently two standards for signaling and control of Internet telephone calls, namely ITU-T Recommendation H.323 and the IETF Session Initiation Protocol (SIP). We describe how a signaling gateway can allow SIP user agents to call H.323 terminals and vice versa. Our solution addresses user registration, call sequence mapping and session description. We also describe and compare variou...

This document describes how the IPv4 Session Initiation Protocol (SIP) user agents can communicate with IPv6 SIP user agents (and vice versa) at the signaling layer as well as exchange media once the session has been successfully set up. Both singleand dual-stack (i.e., IPv4-only and IPv4/IPv6) user agents are considered.

Session mobility is the transfer of media of an ongoing communication session from one device to another. This document describes the basic approaches and shows the signaling and media flow examples for providing this service using the Session Initiation Protocol (SIP). Service discovery is essential to locate targets for session transfer Shacham, et al. Expires May 21, 2008 [Page 1] Internet-D...

This document specifies a mechanism for usage of SCTP (the Stream Control Transmission Protocol) as the transport mechanism between SIP (Session Initiation Protocol) entities. SCTP is a new protocol that provides several features that may prove beneficial for transport between SIP entities that exchange a large amount of messages, including gateways and proxies. As SIP is transport-independent,...