[SIPForum-discussion] who can help me? thx!

[Maheedharan s]

The Record-Route header field is inserted by proxies in a request to
   force future requests in the dialog to be routed through the proxy.
Record-Route: <sip:server10.biloxi.com;lr>,
                    <sip:bigbox3.site3.atlanta.com;lr>

Example:
      
Rewriting Record-Route Header Field Values
   In this scenario, U1 and U2 are in different private namespaces and
   they enter a dialog through a proxy P1, which acts as a gateway
   between the namespaces.
      U1->P1->U2
   U1 sends:
      INVITE sip:callee at gateway.leftprivatespace.com SIP/2.0
      Contact: <sip:caller at u1.leftprivatespace.com>
   P1 uses its location service and sends the following to U2:
      INVITE sip:callee at rightprivatespace.com SIP/2.0
      Contact: <sip:caller at u1.leftprivatespace.com>
      Record-Route: <sip:gateway.rightprivatespace.com;lr>
   U2 sends this 200 (OK) back to P1:
      SIP/2.0 200 OK
      Contact: <sip:callee at u2.rightprivatespace.com>
      Record-Route: <sip:gateway.rightprivatespace.com;lr>
   P1 rewrites its Record-Route header parameter to provide a value that
   U1 will find useful, and sends the following to U1:
      SIP/2.0 200 OK
      Contact: <sip:callee at u2.rightprivatespace.com>
      Record-Route: <sip:gateway.leftprivatespace.com;lr>
   Later, U1 sends the following BYE request to P1:
      BYE sip:callee at u2.rightprivatespace.com SIP/2.0
      Route: <sip:gateway.leftprivatespace.com;lr>
   which P1 forwards to U2 as:
      BYE sip:callee at u2.rightprivatespace.com SIP/2.0

 
Maheedharan.S
cai youyuan <cyyyuanyou at hotmail.com> wrote:
how to understand Record-Route and Route header field in sip, which 
difference between them?
expect your answer, any letter is welcome.

caiyouyuan

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