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What Is The Significance Of The Via Header Field?

Answer»

Each 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 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. And also contain "branch" parameter.

Each 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 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. And also contain "branch" parameter.


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