Emergency Calling Architecture

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Presentation transcript:

Emergency Calling Architecture Henning Schulzrinne Dept. of Computer Science Columbia University hgs@cs.columbia.edu September 2005 VON Boston

Overall pieces needed Obtain civic and/or geo location End system must obtain emergency dial sequences 911, 112 + regional variations possibly for multiple different services Map location to PSAP(s) Identify call as an emergency call Mid-call behavior call-backs, caller-initiated BYE, call transfer at PSAP, location updates, … September 2005 VON Boston

Stages I1 I2 I3 spec. available? use 10-digit admin. number? mobility callback number to PSAP? caller location to PSAP? PSAP modification ALI (DB) new services I1 now allowed stationary no none I2 June 2005 nomadic yes no (8 or 10 digit) update I3 2005 mobile IP-enabled ALI not needed MSAG replaced by DNS location in-band GNP multimedia international calls September 2005 VON Boston

Architecture DHCP DHCP September 2005 VON Boston VSP ISP SIP config PSAPs outbound proxy DHCP home September 2005 VON Boston

Mapping architecture carrier X customers R R R R R R flooding nj.us knows all trees; caches results R R R R R R flooding nj.us ny.us bergen.nj.us leonia.bergen.nj.us September 2005 VON Boston