Modern all-IP networks, which transfer telephony, multimedia and data use mainly as signalling protocol the Session Initiation Protocol (SIP). These networks are exposed to various types of attacks, and among them, a DDoS attack can result particularly dangerous, because it can be directed against the SIP signalling system. A shield can be implemented only after the detection of an attack, henc...

The Stream Control Transmission Protocol (SCTP) is a relatively recent transport protocol, offering features beyond TCP. Although SCTP is an alternative transport protocol for the Session Initiation Protocol (SIP), we do not know how SCTP features influence SIP server scalability and performance. To estimate this, we measured the scalability and performance of two servers, an echo server and a ...

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 and is discussed using the Service Location Protocol (SL...

This document defines and registers with IANA the new "fax" media feature tag for use with the Session Initiation Protocol (SIP). Currently, fax calls are indistinguishable from voice calls at call initiation. Consequently, fax calls can be routed to SIP user agents that are not fax capable. A "fax" media feature tag implemented in conjunction with caller preferences allows for more accurate fa...

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) will be used as the signalling protocol in the IP Multimedia (IM) Subsystem of the 3rd Generation Partnership Project (3GPP) UMTS networks. Using the protocol on a large scale to provide equivalent telephony service requires Quality of Service (QoS) observations. This paper discusses SIP signalling resources and their impact on the QoS. The first part summa...

A lot of attractive applications in addition to manipulation of session related signaling involve specific processing at media level such as playing media, prompting and collecting media from the user, mixing media streams etc. One of the ways of provisioning applications in managed all IP-based multimedia networks, is based on Open Service Access (OSA) service platform. The paper investigates ...

Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Abstract This document provides examples of Session Initiation Protocol (SIP) test messages designed to exercise and "torture" the code of an IPv6-enabled SIP implementation. Gurbani, et al. Informational [Page 1]

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes a set of managed objects that are used to manage Session Initiation Protocol (SIP) entities, which include User Agents, and Proxy, Redirect and Registrar servers. Lingle, et al. Standards Track [Page 1] RFC 4780 SIP MIB Modules Apr...

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes a set of managed objects that are used to manage Session Initiation Protocol (SIP) entities, which include User Agents, and Proxy, Redirect and Registrar servers. Lingle, et al. Standards Track [Page 1] RFC 4780 SIP MIB Modules Apr...