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# SIP RFC3261's Example  
# SIP Protocol Structure
# SIP Dialogs & Routing
# SIP Service Examples
 01.Call Hold
 02.Consultation Hold
 03.Music On Hold
 04.Transfer: Unattended
 05.Transfer: Attended
 06.Transfer: Instant Messaging
 07.Call Forwarding Unconditional
 08.Call Forwarding Busy
 09.Call Forwarding No Answer
 10.3-Way Conf: 3rd Party Added
 11.3-Way Conf: 3rd Party Joins
 12.Find-Me
 13.Incoming Call Screening
 14.Outgoing Call Screening
 15.Call Park
 16.Call Pickup
 17.Automatic Redial
 18.Click to Dial
# ABNF Grammars
  - SIP Messages & URIs
  - SIP Headers
  - SIP Private Headers
  - SDP
  - URI Generic Syntax
  - ABNF Notation & Rules
# Cryptography Basics

SIP Service Examples:
11. Three-Way Conference (Third Party Joins)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Three-Way Conference (Third Party Joins)
Top 1) INVITE (A2B) 2) 180 Ringing 3) 200 OK 4) ACK (A2B) 5) INVITE (C2B Join:A-B) 6) 180 Ringing
Prev Next 7) INVITE (B2A) 8) 200 OK 9) ACK (B2A) 10) 200 OK (B2C) 11) ACK (C2B)

Last update: November 19, 2009 
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