ECRIT - Getting Certain URIs, and Alternatives to Getting Emergency Dialstring(s) draft-polk-ecrit-lost-server-uri-00 draft-polk-dhc-ecrit-uri-psap-esrp-00 draft-polk-dhc-ecrit-uri-lost-00 draft-polk-ecrit-dhc-emergency-dialstring-option-00 draft-polk-ecrit-mapping-during-registration-00 draft-polk-ecrit-emergency-dialstring-00 James Polk July 11, 2006

OK, let’s get this over with, eh?

What are these 6 IDs discussing? How to get a (sometimes preferred) LoST Server, and/or PSAP/ESRP, URI(s) into an endsystem How to get a (sometimes preferred) emergency dialstring(s) into an endsystem No one ID discusses both

Where are these mechanisms used? Access Providers and Enterprises (of all sizes) *can* use DHCP for users to request and/or deliver URIs and Emergency Dialstrings VSPs (which could be from a local network or Call processing on the other side of planet) will have SIP communications with endpoints, thus SIP UAs *can* request and/or deliver URIs and Emergency Dialstrings

How are these Mechanisms used? During Network Attachment time and/or periodic refresh, specific info *can* be requested for download, or just downloaded to endsystem Instead of new protocols, all 6 IDs propose extensions to either DHCP or SIP, which are already a given in most, if not all endsystems

Attachment Time configuration Alice sends DISCOVER message Domain A Domain C Domain D Domain BDomain E Domain F DHCP Server Alice LIS Server DHCP Server DHCP Server may interact with LIS Alice receives (URI(s), and/or Dialstring(s) draft-polk-dhc-ecrit-uri-lost-00 draft-polk-dhc-ecrit-uri-psap-esrp-00 draft-polk-ecrit-dhc-emergency-dialstring-option-00 also Domain A

Contacting a specific Server Alice may attach here... Domain A Domain C Domain D Domain BDomain E Domain F Registrar Server Alice LIS Server also Domain A

...or here Either way, she may want – or need – to communicate here Domain A Domain C Domain D Domain BDomain E Domain F LIS Server Alice Contacting a specific Server Registrar Server LIS Server also Domain A These may be access/core providers only, and not trusted by Alice or her org

Contacting a specific Server Domain A Domain C Domain D Domain BDomain E Domain F Registrar Server Alice LIS Server also Domain A draft-polk-ecrit-lost-server-uri-00 draft-polk-ecrit-mapping-during-registration-00 draft-polk-ecrit-emergency-dialstring-00 Alice sends SIP REGISTER with Location Registrar Server may interact with LIS Alice receives 200 OK w/ URI(s), and/or Dialstring(s)

Domain A Domain C Domain D Domain BDomain E Domain F LIS Server Alice Contacting a specific Server Registrar Server LIS Server also Domain A draft-polk-ecrit-lost-server-uri-00 draft-polk-ecrit-mapping-during-registration-00 draft-polk-ecrit-emergency-dialstring-00 Alice sends SIP REGISTER with Location Registrar Server may interact with LIS Alice receives 200 OK w/ URI(s), and/or Dialstring(s)

DHCP Messaging 101 DHCP Clients query for configuration information DHCPDISCOVER (Options listed) DHCPOFFER (Options answered) AliceDHCP ServerLIS Server DHCPREQUEST (Options listed) DHCPACK (Options answered) DHCP Clients update configuration information

DHCP Messaging including LIS DHCPDISCOVER (Options listed) LoST Query DHCPOFFER (Options answered) AliceDHCP Server LoST Response LIS Server DHCPREQUEST (Options listed) DHCPACK (Options answered) DHCP Clients query for configuration information –Could include Location or Location specific information DHCP Clients update configuration information LoST transaction

DHCP Messaging including LIS DHCPDISCOVER (Options listed) LoST Query DHCPOFFER (Options answered) AliceDHCP Server LoST Response LIS Server DHCPREQUEST (Options listed) DHCPACK (Options answered) DHCP Clients query for configuration information –Could include Location or Location specific information DHCP Clients update configuration information LoST transaction

draft-polk-dhc-ecrit-uri-lost-00 Specifies how an Access Network (SP, Enterprise, SMB, home) provides a LoST Server URI –By creating a new DHCP Option for the LoST server –May or may not involve a location resolution to return URI Motivation: This is the easiest means of getting a LoST URI into a client Open Issues – change filename to -ecrit-

draft-polk-ecrit-dhc-emergency-dialstring-option-00 Specifies how an Access Network (SP, Enterprise, SMB, home) provides a local or visited emergency dialstring –By creating a new DHCP Option for what is important, or required to be understood, on that network –May or may not involve a location resolution to return URI Motivation: This is the easiest means of getting a LoST URI into a client Open Issues – keep ISO country code?

draft-polk-dhc-ecrit-uri-psap-esrp-00 Specifies how an Access Network (SP, Enterprise, SMB, home) provides a PSAP/ESRP URI –By creating a new DHCP Option for the appropriate PSAP/ESRP –Means DHCP Server will have to implement LoST Unless there is only one answer ever Motivation: Local network may be in best position to provide this easy to deliver URI Open Issues – change filename to -ecrit-

SIP Registration 101 SIP UAs Register within a Domain for a certain amount of time –Generally advisable to use TLS, thus this is secure communications anyway SIP REGISTER 200 OK AliceSIP RegistrarLIS Server UAs refresh registration periodically SIP REGISTER (refresh) 200 OK

SIP Registration including LIS SIP REGISTER (w/ PIDF-LO) 200 OK (with unique Loc parameters) AliceSIP RegistrarLIS Server SIP REGISTER (refresh) 200 OK (refreshed parameters) LoST Query LoST Response LoST transaction SIP UAs Register within a Domain for a certain amount of time –Can include Location by-value or by-reference for unique parameters –Can include an option-tag requesting additional info sent back UAs refresh registration periodically

SIP Registration including LIS SIP REGISTER (w/ PIDF-LO) 200 OK (with unique Loc parameters) AliceSIP RegistrarLIS Server SIP REGISTER (refresh) 200 OK (refreshed parameters) LoST Query LoST Response LoST transaction SIP UAs Register within a Domain for a certain amount of time –Can include Location by-value or by-reference for unique parameters –Can include an option-tag requesting additional info sent back UAs refresh registration periodically

draft-polk-ecrit-lost-server-uri-00 Specifies how an Application Provider (SP, Enterprise, SMB, home) provides a LoST Server URI –By creating a new SIP option-tag and header for the LoST server Motivation: Application provider is the one often responsible for emergency calling results, but can’t be if it doesn’t give this answer Open Issues – none

draft-polk-ecrit-emergency-dialstring-00 Specifies how an Application Provider (SP, Enterprise, SMB, home) provides a local or visited emergency dialstring –By creating a new SIP option-tag and header for what is important, or required to be understood, on that network when a user enters a locally significant dialstring Motivation: SIP solution within existing TLS secure registration from a trusted server Open Issues – change filename to -ecrit- –BNF needs to be corrected

draft-polk-ecrit-mapping-during-registration-00 Specifies how an Application Provider (SP, Enterprise, SMB, home) provides a PSAP/ESRP URI –By creating a new SIP option-tag and header for the appropriate PSAP/ESRP –Means SIP Registrar will have to implement LoST Unless there is only one answer ever Motivation: Application Provider has trusted servers (by contract), and may be bound to provide this URI Open Issues – change filename to -ecrit-

Open issues here Listed under each ID’s slide Asked by DHC chairs to move all related IDs over to ECRIT, resulting in two of these IDs getting new filenames very soon

What’s Next? Take comments how to improve each ID Want several to become WG items –draft-polk-ecrit-lost-server-uri-00 –draft-polk-dhc-ecrit-uri-lost-00 –draft-polk-ecrit-dhc-emergency-dialstring-option-00 –draft-polk-ecrit-emergency-dialstring-00 Willing to keep PSAP URI IDs individual for now, unless WG thinks otherwise is best