SIP Invite (method/URI/version)

INVITE sip:bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP pc33.atlanta.com:5060;branch=z9hG4bK776asdhds
To: Bob <sip:bob@biloxi.com>
From: Alice <sip:alice@atlanta.com>;tag=1928301774
Call-ID: a84b4c76e66710
CSeq: 314159 INVITE
Contact:<sip:alice@pc33.atlanta.com>
Content-Type: application/sdp
Content-Length: 142
(Alice’s SDP not shown)

Start Line is the first line of a SIP message which contains:

method or Request type: INVITE
Request-URI which indicates who the request is for: sip:bob@biloxi.com
SIP version number: SIP/2.0

Transcript

[slide130] Now, digging into the INVITE a little more, we see the INVITE, that's the method, or the request type, we see the request URI, and we see the version number.