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

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

3. 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

4. Possible Solutions Depend On The Application Scenario abc def ghi jkl PSTN Gateway Target ECC PSTN Gateway ECC SIP network Routed as emergency call Routed as ordinary call SIP Phone: stationary vs. nomadic Emerg. Services DB

5. 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