Session Initiation Protocol. By, Vivek Nemarugommula. Background. Overview Of Operation Structure Of The Protocol Definitions SIP Messages Dialogs. Overview.
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Session Initiation Protocol
endpoints (User Agents) initiate, modify and terminate sessions.
negotiation (SDP), media transport (RTP), name
resolution and mobility (DHCP, DNS), and application encoding (MIME)
HTTP-like request/ response
new ‘Methods’ and ‘Headers`
path and data stream path.
User Agent (UA)
components can act as client and as server.
a server and its response.
Start Line: conveys message type & protocol version
Headers: to convey message attributes and to modify
Body: to describe the session to be initiated or to transport opaque textual or binary data. Body types: SDP, MIME, others)
The “server under test” (SUT) is a SIP proxy, redirect or registrar server whose performance is to be estimated. The benchmark consists of a set of SIPstone load generators that create the SIP request load, a call handler that simulates a user agent server and a central benchmark manager (“coordinator”) that coordinates the execution of the benchmark, and the SUT.
The individual tests are:
INVITE request to the SUT acting as a
redirect server. The transaction delay
is measured from sending the INVITE
request to receiving the 3xx response.
The TRT is measured only for the INVITE request.
Classic Threat Models