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SIP is a Distributed Architecture
8/31/2005
Copyright - Ahlgren 2005
15
AhlTek
Peer to Peer
Proxy Server
User Agent
Server
User Agent
Client
INVITE: msb
INVITE: msb
INVITE: msb
Ack
Ack
Ack
Media
Media
[email protected]
[email protected]
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Introduction to SIP and VoIP
1
What is SIP ?
3
How can SIP be used?
4
SIP Based Products
5
Who is using SIP?
6
Who Invented SIP?
7
SIP Standardization Efforts
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Supported by Multiple
9
Standards Groups
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Related IETF Working Groups
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A Remarkably Fast Timeline !
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SIP - A New Generation of
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Communication Services
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What Did SIP Inherit?
13
SIP Design Choices
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Peer to Peer
15
Proxy Server
15
SIP is Not
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SIP Not a Transport
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SIP Needs Other Protocols
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Session Description Protocol
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Real Time Transport Protocol
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SIP Application Server
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SIP Practical Issues
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SIP Functionality
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Major Components of the SIP
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Environment
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SIP Message
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Message Types
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Status Codes
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Basic Message Format
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Message - START LINE
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Message - HEADERS Fields
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Message - BODY (CONTENT)
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Message - SAMPLE
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SIP Call Flow - Direct
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SIP Questions Now?
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VoIP – Reinventing the Wheel
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VoIP Advantages
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What services do you get?
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Making the VoIP Connection
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Product Examples
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And VoIP can be Invisible
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VoIP Architectures
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VoIP Codecs –
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Bandwidth Requirements
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NAT Transversal
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VoIP Network Performance
45
Considerations
45
SIP and QoS Control
46
QoS Protocols
47
Questions – VoIP
48
Attachments
49
Thank You
50
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