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Emergency Calling Services (Calls for police, fire, ambulance, etc.). SIPPING WG IETF 58 Tom Taylor [email protected] Looking at Emergency Calling Service (Calls to police, fire, ambulance, etc.). Call Origin. Emergency Call Centre Location. IP Network. PSTN. PSTN. Legacy.

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looking at emergency calling service calls to police fire ambulance etc
Looking at Emergency Calling Service(Calls to police, fire, ambulance, etc.)

Call Origin

Emergency Call Centre Location

IP Network

PSTN

PSTN

Legacy

EMERGING

draft-schulzrinne-sipping-emergency-req

SIP Phone

draft-schulzrinne-sipping-sos

NOW!

draft-taylor-sipping-emerg-scen

issues considered
Issues Considered
  • Identifying emergency calls
    • SIP phone or network may have to recognize numbers
    • universal emergency URI a partial solution
    • have to distinguish between regular and hearing impaired ECCs in some jurisdictions
  • Routing from the SIP phone to the target ECC
    • depends on caller location
  • Presenting caller location at the ECC
    • calling party number used to determine caller location
    • PSTN may determine calling party number based on incoming circuit
  • Presenting callback number at the ECC
    • PSTN gateway may have to provide limited-lifetime number, map back to non-numeric SIP URI
  • Holding the caller accountable for the call
    • tradeoff: user/device authentication vs. importance of handling emergency
possible solutions depend on the application scenario

DB

DB

DB

Possible Solutions Depend On The Application Scenario

Target

ECC

PSTN

Gateway

Emerg.

Services

abc

def

ghi

jkl

PSTN

Gateway

ECC

SIP Phone:

stationary

vs.

nomadic

SIP

network

Routed as emergency call

Routed as ordinary call

looking forward
Looking Forward
  • Requirement to carry location info in SIP
    • confidentiality, integrity – applies to call signalling as a whole
    • usable by proxies, PSTN gateways for call routing
    • may be inserted by SIP phone or by proxy
    • ideally, could be constructed by SIP phone based on manual configuration
      • hotel room example
  • Potential BCP work for devices
  • Potential BCP work for network operation
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