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URI As Service Indicator: Requirements

URI As Service Indicator: Requirements. Eric W m . Burger eburger@snowshore.com. Fundamental Question. Is There a Single Mechanism for Specifying Application Service Network Service Application Service Voice Mail, Unified Messaging, Pre-Paid, etc. Network Service

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URI As Service Indicator: Requirements

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  1. URI As Service Indicator: Requirements Eric Wm. Burger eburger@snowshore.com SIP/SIPPING Interim Meeting

  2. Fundamental Question • Is There a Single Mechanism for Specifying • Application Service • Network Service • Application Service • Voice Mail, Unified Messaging, Pre-Paid, etc. • Network Service • Announcement, Prompt & Collect, Start Script SIP/SIPPING Interim Meeting

  3. Characteristics of an Application Service (1/2) • Subscriber-Based • Provided By Proxy and Application Servers • Often Subscriber-Provisioned • Often Different Variations • Busy Greetings, Internal/External Caller By • Call Info / History (ISUP) • Selected URI (RFC 3087) • Personal Assistant:Subscriber vs. Caller Service SIP/SIPPING Interim Meeting

  4. Characteristics of an Application Service (2/2) • Number of Services Is Limitless • Bounded By Imagination • Flexibility in Scheme Has Definite Value • Interoperation Required Between • Proxy Servers • Application Servers • User Agent SIP/SIPPING Interim Meeting

  5. Examples of Application Service SIP Request-URIs • Deposit voice mail for RJS sip:deposit-sub-rjs@vm.provider.net • Deposit voice mail for RJS w/ busy greeting sip:deposit-busy-sub-rjs@vm.provider.net • Retrieve RJS’ voice mail sip:retrieve-sub-rjs@vm.provider.net • Start a prepaid call session (registered) sip:start-fancy-prepaid-outidal@pp.provider.net • Do magic application; proxy figures out where (registered) sip:do-my-magic@provider.net SIP/SIPPING Interim Meeting

  6. Characteristics of a Network Service (1/2) • Not Subscriber-Based • Provided By Media Server • Generally No Provisioning • Limited Variations • Announcement, Conference, Script, IVR • Flexible Scheme Has Limited Value and Definite Drawbacks SIP/SIPPING Interim Meeting

  7. Characteristics of a Network Service (2/2) • Interoperation Required Between • Proxy Servers and Media Servers • Application Servers and Media Servers • Possible, But Not Likely, to Expose Network Services to End Users SIP/SIPPING Interim Meeting

  8. Examples of Network Service SIP Request-URIs • Play an Announcement sip:annc@ms.provider.net;play=\http%3f//fs.provider.net/vacant-subscriber.g711 • Join Leg to a Mixer (Conference) sip:conf=asj4040j@ms.provider.net • Start an IVR Session (MSCML) sip:ivr@ms.provider.net • Start a Script sip:annc@ms.provider.net;voicexml=\http%3f//as.provider.net/prepaid.vxml SIP/SIPPING Interim Meeting

  9. Requirements for Application Services • Scheme Cannot Constrain Existing Services • Scheme Cannot Constrain New Services • Scheme Cannot Constrain Clients • Scheme Cannot Constrain Servers • Scheme Must Allow for User Defined Services (draft-campbell-pub-bind-reqs-00) • Scheme Must Allow for Interoperability • Mapping to Service Must Happen “In Human Time” (300ms – 500ms) SIP/SIPPING Interim Meeting

  10. Requirements for Network Services • Applications Must Be Able to Address Services • Services Must Be REGISTER-Friendly • Network Must Be Able to Proxy Services • Mapping to Service Must Happen “In Machine Time” (1ms – 20ms) • Often Part of Multiple Interactions With User • User Expects “Responsive Service” • Cannot Have Many Round-Trips SIP/SIPPING Interim Meeting

  11. Offering • Applications (Application Services) Have Different Requirements Than Network Services Is There Consensus On This Point? SIP/SIPPING Interim Meeting

  12. Proposal: Application Services • Naming Services Is The Name Binding Problem • End User / Proxy / Application Needs to Direct Call to Application Service Entity • Many Ways to Address Application Service Entity • No Single “Right Way”, As In History Discussion • Problem Is Bigger Than SIP • Appropriate Technologies May Be Service Registries, etc. • Considering It For My PhD Topic… SIP/SIPPING Interim Meeting

  13. Proposal: Network Services • Extremely Limited Vocabulary of Network Services • Dipping Into Service Registry Impacts Ability To Meet Lookup Constraint • Must Have Single Mapping For Interoperation • Use Fixed Service Indicators (LHS) SIP/SIPPING Interim Meeting

  14. Discussion SIP/SIPPING Interim Meeting

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