Request Methods

Response Codes

SIP Headers

INVITE – Example

RESPONSE (200 OK) – Example

More on Headers

Support and Require Headers

Timer (Session Times)

100rel (PRACK)

Short form ‘compact’ Headers

SDP – the Session Description Protocol

SDP in a SIP Message

一个SDP 实例

Extending SDP

Multiple ‘m’ lines

Changing Session Parameters

SDP Example - Put a call on Hold

SDP Example - Call Hold Trace

Call Hold – Old and New Methods

Music on Hold example

INVITE and reINVITE

SIP Mobility

SIP Mobility

SIP Call Forking - Parallel

SIP Call Forking - Sequential

Call legs, dialogs and Call IDs

Dialog trace example

Dialogs and Transactions

Branch Ids

Call Forward to Voicemail

Call Forward - No Answer

Replaces header

Diversion headers

More on Proxies and SIP Routing

Stateless Proxy

Stateful Proxy

More Proxy information

VIA and Record Route

VIA Details

Record-Route Defined

Record Route Example

Loose and Strict Routing

Session Policies

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