Emergency Calling Services (Calls for police, fire, ambulance, etc.) SIPPING WG IETF 58 Tom Taylor taylor@nortelnetworks.com

Looking at Emergency Calling Service (Calls to police, fire, ambulance, etc.) Call Origin Emergency Call Centre Location PSTN IP Network PSTN Legacy EMERGING draft-schulzrinne-sipping-emergency-req SIP Phone draft-schulzrinne-sipping-sos NOW! draft-taylor-sipping-emerg-scen

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 Target ECC PSTN Gateway Emerg. Services abc def ghi jkl SIP Phone: stationary vs. nomadic PSTN Gateway ECC SIP network DB DB DB Routed as emergency call Routed as ordinary call

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