Why The Name Labels Will Be Used In To And From Header Fields? To and From header fields show the originator and destination of the SIP request. What Are The Significance Of To And From Header Fields? It is initialized to some large integer and decremented by each SIP server which receives and forwards the request. Max-Forwards header field is used for simple loop detection.
What Is The Significance Of Max-forwards Header Field? It is signified as the transaction identifier used to correlate the reponses to the request. Where The Branch Parameter Is Used And What Is Its Significance?Ī "branch" parameter is used in "Via" header field. The Via header field contains the SIP version number (2.0), a “/”, then UDP for UDP transport, a space, then the hostname or address, a colon, then a port number. What Is The Significance Of The Via Header Field?Įach SIP device that originates or forwards a SIP message stamps its own address in a "Via" header field, usually written as a host name that can be resolved into an IP address using a DNS query.
The Request-URI is a special form of SIP URI and indicates the resource to which the request is being sent, also known as the request target. The Session Initiation Protocol (SIP) is a signaling, presence and instant messaging protocol developed to set up, modify, and tear down multimedia sessions, request and deliver presence and instant messages over the Internet.
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