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The SIP URI scheme is a Uniform Resource Identifier (URI) scheme for the Session Initiation Protocol (SIP) multimedia communications protocol. A SIP address is a URI that addresses a specific telephone extension on a voice over IP system.
The URI scheme used for SIP is sip and a typical SIP URI has the form sip:username@domainname or sip:username@hostport, where domainname requires DNS SRV records to locate the servers for SIP domain while hostport can be an IP address or a fully qualified domain name of the host and port.
RFC 3261 SIP: Session Initiation Protocol June 2002 The Contact header field values of the request typically consist of SIP or SIPS URIs that identify particular SIP endpoints (for example, "sip:carol@cube2214a.chicago.com"), but they MAY use any URI scheme.
Shortly after its debut as a standard in 1999, SIP was adopted by the 3rd Generation Partnership Project (3GPP) as the preferred signaling protocol for the Internet Multimedia Subsystem (IMS).
URI - Uniform Resource Identifier - Use for SIP identity and is similar to an email address. As example, a SIP URI could be sip:johns@xyzcorp.com; Proxy Server - Manages connection requests between UA and other proxy servers. Also provides authentication and authorization.
Resources on a SIP network are identified by a uniform resource identifier (URI), which takes the following generic format: sip:username:password@host:port. If the port is not specified, it defaults to 5060. For secure SIP transmission over TLS, an s may be added to the end of sip to make it sips: sips:username:password@host:port
URL parameters: SIP URLs can define specific parameters of the request. URL parameters are added after the host component and are separated by semi-colons. The transport parameter determines the the transport mechanism (UDP or TCP). UDP is to be assumed when no explicit transport parameter is included.
