Session Initiation Protocol Security: A Brief Review
The Session Initiation Protocol (SIP) is an application layer used for signaling protocols specified by the Internet Engineering Task Force (IETF). SIP has recently become the main signaling protocol for Internet applications, thus allowing the implementation of a number of features using SIP, such as video conferencing, online gaming, peer-to-peer application, instant messaging, presence services and voice-mail. Hotline services for emergency calls and online flight booking also use SIP. SIP also supports mobile applications, which are more flexible applications than others. SIP is implemented in different wired and wireless networks, which has security issues.