User A sends the INVITE message to a
proxy server. The INVITE request is an
invitation to User B to participate in a
call session.
In the INVITE request:
The IP address of User B is
inserted in the Request-URI
field.
User A is identified as the
call session initiator in the
From field.
A unique numeric identifier
is assigned to the call and
is inserted in the Call-ID
field.
The transaction number
within a single call leg is
identified in the CSeq
field.
The media capability User
A is ready to receive is
specified.
The port on which User B is
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