SIP: Ready to Deploy Jonathan Rosenberg Chief Scientist

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Overview Need for Differentiation SIP Is a Tool for Differentiation Combined services Programmability Extensibility Deployable Momentum Interoperability results IETF standards process

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S What Is The Reality? Toll-bypass Has Been the Primary Motivation Cheap long distance Service transparency Cost Differentials Are Rapidly Disappearing Long distance is now at 5 cents a minute Partial flat rate plans are being rolled out Canadian service providers have moved to a complete flat rate structure Service Transparency Is Far Away QoS issues 911, 1000 features in the 5ESS Huge existing penetration of the phone in US and worldwide

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S The Question Of Customer Value IP Telephony Service Isnt Cheaper, Better or Different, Why Purchase It?

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S The Big Answer IP Telephony Brings Together Disparate Services - Innovative Services Created by Combining Other IP Applications, Such as Web, , Chat and Presence, with Voice The Killer App for VoIP Lives Within These Combined Services

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Combined Services Enable Provider Differentiation Combined Services Yield the Feature Exponentiation Effect The number of possible features grows exponentially with the set of applications combined to provide those features With Many Feature Possibilities, Service Provider Differentiation Becomes a Reality VoiceVoice + Web Voice + Web + Voice + Web + + Presence

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Requirements for Enabling Combined Services Needs to Work Among Heterogeneous Devices PC access Traditional PSTN access Stand-alone IP phone access Needs to Work Among Heterogeneity of Capabilities Some devices have web Some devices have Some devices have no video

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Requirements for Enabling Combined Services Needs to Integrate Seamlessly with Web and Should understand http and mailto URLs Should be able to carry web pages Should be able to start calls by clicking on hyperlinks Should be able to carry Java applets Should be able to work with naming and routing facilities

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Programmability Key Requirements Rapid Service Deployment Is Critical Should Be as Easy to Create a New Phone Service as Building a Web Page Compare PSTN service deployment cycles with Web service deployment cycles Should Be Accessible to All Service providers Enterprise administrators End users

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Key Requirements Focus Simple Protocol Models Simple APIs Open APIs Open Access to Service Plane

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Solution: Session Initiation Protocol (SIP) Heterogeneity of capabilities solved: MIME MIME = Multipurpose Internet Mail Extensions Used to support transfer of different content in and web Defines numerous headers for indication and negotiation of content Allows clients to indicate types supported in SIP messages Web pages Java applets JPEGs PSTN Gateway Proxy INV Accept: text/html, application/sdp INV Accept: application/sdp Contact: Contact:

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Solution: SIP Heterogeneity of Devices Solved: Implementation Flexibility SIP specification defines several levels of implementation Minimal Basic Firewall-friendly Redirection Negotiation Authentication Required headers at each level defined

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Solution: SIP continued Minimal Implementation Is Interoperable and Thin Known implementations in standalone phones < 128K Full Implementation Is More Complex but Extremely Powerful

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S SIP Integration with Web and SIP Works Very Well with Web and Three Fundamental Reasons MIME URIs DNS

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S SIP and MIME SIP Uses MIME for Body Transport Allows access to vast registry of MIME types Allows usage of numerous encoding and compression techniques Allows usage of basic negotiation capabilities SIP Allows Web Pages, Pictures and Documents to Be Carried Can Even Use Multi-part for Several Bodies Per Message

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S SIP and URIs URI Uniform Resource Identifier - generalization of familiar URL SIP Addresses Are URLs Specifies SIP URL format, similar to mailto SIP Allows Any URI Wherever SIP URL Can Be Placed Applications Can redirect to web page as easily as PC phone Can redirect to complex http URLs to provide web server with data

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S SIP and DNS is Routed in Part, Based on DNS Procedures SIP Uses Nearly Identical Procedures SIP Allows Address to be Valid SIP Address Implications Can completely leverage existing routing systems Forwarding of SIP requests to is trivial Save space on the business card

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Programmability of SIP SIP Has a Simple Architecture Request-response Proxies SIP Architecture Parallels Web Result Numerous SIP APIs under development in standards JAIN SIP servlets XML-based Call Processing Language (CPL) Can leverage existing web programmability tools Common Gateway Interface (CGI)

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S SIP Momentum Vendors and Operators are Now Choosing SIP Softswitches (MGC), gateways, endpoints, application servers SIP-based networks and services (MCI, Level(3), AT&T) SIP in The Pulver Report If you are responsible for building products in the VON industry, you will be making a major mistake if your plans for 2000/2001 don't include support for SIP Jeff Pulver Oct 21, 1999

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S SIP Momentum continued SIP Working Group Created in the IETF Chaired by dynamicsoft 19 Submissions at the first meeting Interim meeting was held before the first meeting to discuss cable protocols (DCS) Other Standards Bodies are Endorsing SIP ETSI Tiphon, traditionally H.323 only, now working on SIP IMTC has a SIP group, and is now working on SIP-H.323 interop

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S SIP Bake-Off Update Mar Apr Aug Dec Number of Attendees Ericsson SIP Accepted By IETF 8 Companies 16 Companies 33 Companies

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S December 99 Bake-off Results 33 Vendors, Over 100 People Most Major Equipment Vendors Complex Call Scenario Completed 7 Different vendors dynamicsoft was the only commercial vendor capable of executing main proxy function Call scenario included: Proxy-Authorization TCP to UDP CANCEL Record Route Reverse BYE Proxy 1 TCP User Agent 1 User Agent 2 User Agent 3 User Agent 4 Proxy 3 Proxy 2

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S IETF Standards Process IETF Process Built for Interoperability Three Phases of an RFC Proposed standard - believed to work SIP is proposed standard Draft standard - known implementations Must demonstrate interop on all features Unused features discarded Standard - widely deployed

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Summary IP Telephony Must Provide Differentiation Critical Requirements for Differentiation Defined Interoperability with existing IP apps Handles heterogeneity Programmable SIP Meets These Requirements SIP Has Momentum, Acceptance and Interoperability Ready to Deploy!

dynamicsoft Inc. C O N N E C T I N G T H E W O R L D W I T H A P P L I C A T I O N S Information Resource Jonathan Rosenberg