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Emergency Service Identifiers. Presented by Henning Schulzrinne Columbia University [email protected] Service URN. Idea: Identifiers to denote emergency calls and other generic (communication) services Described in draft-ietf-ecrit-service-urn-05.txt (passed WGLC; sent to the IESG)

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Emergency service identifiers l.jpg

Emergency Service Identifiers

Presented by Henning Schulzrinne

Columbia University

[email protected]

SDO Emergency Services Coordination Workshop (ESW06) 


Service urn l.jpg
Service URN

  • Idea: Identifiers to denote emergency calls

    • and other generic (communication) services

  • Described in draft-ietf-ecrit-service-urn-05.txt (passed WGLC; sent to the IESG)

  • Document defines the following emergency service identifiers:

    sos General emergency services

    sos.animal-control Animal control

    sos.fire Fire service

    sos.gas Gas leaks and gas emergencies

    sos.marine Maritime search and rescue

    sos.mountain Mountain rescue

    sos.physician Physician referral service

    sos.poison Poison control center

    sos.police Police, law enforcement

SDO Emergency Services Coordination Workshop (ESW06) 


Counseling services l.jpg
‘counseling’ services

SDO Emergency Services Coordination Workshop (ESW06) 


Services under discussion l.jpg
Services under discussion

  • “211” (social service referral), “311” (non-emergency government services)

  • Emergency services (first responders)

    • used by PSAP, not civilians

    • e.g., urn:service:es:police

  • Non-emergency commercial services

    • urn:service:restaurant.italian

    • urn:service:transportation.taxi

SDO Emergency Services Coordination Workshop (ESW06) 


Ua recognition ua resolution l.jpg
UA recognition & UA resolution

location information

mapping

mapping may recurse

DHCP

LLDP-MED

9-1-1

(dial string)

leonianj.gov

INVITE urn:service:sos

To: urn:service:sos

Route: sip:[email protected]

<location>

INVITE urn:service:sos

To: urn:service:sos

Route: sip:[email protected]

<location>

identification TBD

SDO Emergency Services Coordination Workshop (ESW06) 


Ua recognition proxy resolution l.jpg
UA recognition & proxy resolution

mapping

9-1-1

(outbound proxy)

provider.com

INVITE urn:service:sos

To: urn:service:sos

<location>

INVITE urn:service:sos

To: urn:service:sos

Route: sip:[email protected]

<location>

SDO Emergency Services Coordination Workshop (ESW06) 


Ua recognition proxy resolution proxy location determination l.jpg
UA recognition & proxy resolution(proxy location determination)

mapping

9-1-1

provider.com

INVITE sip:[email protected]

To: urn:service:sos

Geolocation: <location>

INVITE urn:service:sos

To: urn:service:sos

SDO Emergency Services Coordination Workshop (ESW06) 


Proxy recognition proxy resolution l.jpg
Proxy recognition & proxy resolution

mapping

9-1-1

provider.com

INVITE urn:service:sos

To: sip:[email protected];user=phone

Geolocation: <location>

Route: sip:[email protected]

INVITE sip:[email protected];user=phone

To: sip:[email protected];user=phone

SDO Emergency Services Coordination Workshop (ESW06) 


Labeling requirements l.jpg
Labeling requirements

  • Needs to work even if UAC does not recognize emergency call

  • Needs to survice multiple mappings

    • e.g., country  state  county

  • Needs to play nice with SIP routing architecture

    • e.g., pre-loaded service routes

SDO Emergency Services Coordination Workshop (ESW06) 


Alternatives considered l.jpg

only trust Accept-Contact from same trust domain

see P-Asserted-Identity model (RFC 3325)  brittle

or use Identity model  signed by outbound proxy

unfortunately, not covered by

doesn’t help with UA rec/res model!

creating a new header likely to have similar issues

re-do mapping and ensure that URL matches

server can learn list of “legal” URLs after a while

can fail if mapping is dynamic (advertisement changes)

then just replaces URL

forces each outbound proxy to do mapping

check external source that URL is indeed a PSAP

use draft-ietf-sipping-certs for destination URL, but would need to have a role-based cert “this is a bona-fide PSAP”

easy to posit, harder to deploy globally

can incur significant delay

but only needed when there’s service differentiation

new TLD for PSAPs only 

Alternatives considered

SDO Emergency Services Coordination Workshop (ESW06) 


References and contact info l.jpg
References and contact info

  • IETF ECRIT Working Group

    http://www.ietf.org/html.charters/ecrit-charter.html

  • Service URN IETF Draft

    http://tools.ietf.org/wg/ecrit/draft-ietf-ecrit-service-urn/

SDO Emergency Services Coordination Workshop (ESW06) 


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