The Proliferation of Session Initiation Protocol

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The Proliferation of Session Initiation Protocol

• Matt Lazaro, Sr. Manager, Avaya Inc.

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Agenda

• Basic concepts and introduction to SIP
• Value of SIP in Communications
• Using SIP to enhance the user experience
• Lowering costs with SIP
• Leveraging unparalleled flexibility with SIP

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Introduction to SIP
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SIP Fundamentals

• SIP is
• A signaling protocol for multiple types of
  sessions
• Based on well-known Internet protocols
• Simpler to program, troubleshoot, and integrate
• Able to provide presence, preferences,
• and mobility, natively
• An enabler of Intelligent Communications

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Components of SIP

• Endpoints/User Agents
• User Agent Client
• Generates and sends SIP requests and receives
  responses
• User Agent Server
• Receives SIP requests and generates SIP responses
• Services
• Registrar
• Provides mapping of logical SIP addresses to
  physical SIP addresses
• Location Service
• Used by SIP Proxy or Redirect server to obtain
  the mapping from logical SIP addresses to
  physical SIP addresses
• Proxy Server
• Forwards SIP requests downstream and responses
  upstream
• Redirect Server
• Generates 3xx responses directing clients to
  contact an alternate set of URIs
• Presence Server
• Acts as a Presence Agent or proxy server for
  SUBSCRIBE/NOTIFY requests

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SIP Messages

• Requests (Methods)
• REGISTER
• Register contact information
• INVITE, ACK, CANCEL
• Setting up sessions
• BYE
• Terminating sessions
• OPTIONS
• Querying servers about their capabilities
• SUBSCRIBE, NOTIFY (RFC 3265)
• Event notification framework
• MESSAGE (RFC 3428)
• Instant messages

• Responses
• 1xx Provisional
• request received, continuing to process the
  request
• 2xx Success
• the action was successfully received, understood,
  and accepted
• 3xx Redirection
• further action needs to be take in order to
  complete the request
• 4xx Client Error
• the request contains bad syntax or cannot be
  fulfilled at this server
• 5xx Server Error
• the server failed to fulfill an apparently valid
  request
• 6xx Global Failure
• the request cannot be fulfilled at any server

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Example Call Flow
Bob
Alice
Proxy
Alice calls Bob
Bob answers
Bob hangs up
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What is SIMPLE?http//www.ietf.org/html.charters/
sipping-charter.html

• SIP for Instant Messaging and Presence Leveraging
  Extensions
• IETF working group
• Introduces Presence into communications state
• Builds on RFC 3265
• Now a standard RFC 3856
• Selected as basis for 3gpp networks applications

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What is SIPPING?http//www.ietf.org/html.charters
/sipping-charter.html

• Session Initiation Protocol Project INvestiGation
• IETF working group
• Chartered to document the use of SIP for several
  applications related to telephony and multimedia
• SIPPING-19 refers to SIP Services Examples draft
• draft-ietf-sipping-service-examples-08
• 19 example telephony features implemented in SIP
• Purpose is to ensure that basic features
  interoperate
• Other SIPPING items
• SIP Basic Call Flow Examples (RFC 3665)
• Message Waiting Indication (RFC 3842)

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Example SIP Phone Bootstrap Process

• Power on
• Acquire IP address from DHCP
• Query DHCP for TFTP or otherwise discover SIP
  proxy server address
• Register and authenticate with SIP proxy server
• Begin making and receiving phone calls

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Number Portability NirvanaThe SIP Address of
Record (AOR)

• SIP provides a single user identity, the public
  address
• e.g. sipjsmith_at_avaya.com or sip9085551212_at_avaya.
  com
• User identity maps to any number of devices
• Hoteling and User Mobility are native to SIP

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Major Differences between SIP and H.323

• SIP can be used for more than telephony and video
• SIP is text-based H.323 is binary
• Tones generated locally, dial plan is on phone
• Digits are not transmitted to the PBX until the
  phone completes digit collection based on dial
  plan
• SIP clients can be represented by alpha-numeric
  ids and passwords
• SIP users can associate multiple devices with a
  single AoR

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Enhancing the User Experience
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The Value of SIP in Communications

• Enhance the User Experience
• Reach the right person, at the right time, on the
  right device
• Select from a wide range of communication devices
• Eliminate phone tag, wasted communications
• Be mobile and available, but in control of your
  privacy

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SIP Simplifies CommunicationRight person, right
time, right device

• Connect people with people, not with devices
• Single user identity SIP Address of Record is
  mapped across multiple devices (e.g.
  sipjoe_at_avaya.com or sip9085551212_at_avaya.com)
• Calls automatically route to the preferred device
  that is being used

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SIP Enables CollaborationExample Contact Center
Scenario
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Lowering TCO in the Communications Environment
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The Value of SIP in Communications

• Lower TCO
• Simplify networks and optimize connectivity
• SIP-enable at a low cost
• Leverage across multiple applications
• Centralize collaboration tools and extend at
  low-cost
• Leverage SIPs standardized interoperability

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SIP Simplifies Networks A Single Pipe to the Cloud
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Leveraging SIPs Unparalleled Flexibility
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The Value of SIP in Communications

• Leverage Unparalleled Flexibility
• Mix/match with off-the-shelf applications
• Customize with general web skill sets
• Leverage solutions from a rapidly-growing
  eco-system

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Customize with general web skills

• SIP application development can leverage the
  hundreds of thousands of web programmers
• Not limited to those with specialized CTI skills
• SIP brings to real-time communications the same
  powerful set of tools that HTML and web browsers
  bring to data communications
• Embed presence and communications into business
  process

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Use Case High Value Trading Customer Contact

• Transform live feeds from around the world on
  stock and bond movement into Instant Notification
  and on demand Conference triggers. When
  thresholds are crossed, proactively communicate
  with high value clients, alerting the client
  advisor and offering to bring client and advisor
  into an immediate conference with the information
  at hand.

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Official Convergence Communication Providerfor
the 2002 and 2006 FIFA World CupFIFA Womens
World Cup USA 2003
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