[SIPForum-discussion] HELP:a question about the headers in SIP URI

[nancy.fan]

Hi ALL,
can somebody tell me the function of the headers in SIP URI?? what is the
mean of the headers?? can be the message-header in SIP,such as Call-ID? the
following is the definition of SIP URI in RFC3261: 
SIP-URI          =  "sip:" [ userinfo ] hostport
                    uri-parameters [ headers ]

headers         =  "?" header *( "&" header )
header          =  hname "=" hvalue
hname           =  1*( hnv-unreserved / unreserved / escaped )
hvalue          =  *( hnv-unreserved / unreserved / escaped )
hnv-unreserved  =  "[" / "]" / "/" / "?" / ":" / "+" / "$"

 thanks in advance!!

Best Regards.
nancy



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