Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!sun-barr!texsun!texbell!vector!telecom-gateway From: jjjs@cbnewsc.att.com (james.j.sowa) Newsgroups: comp.dcom.telecom Subject: Re: Cellular Phone & E911 Message-ID: Date: 25 May 89 13:26:21 GMT Sender: news@vector.Dallas.TX.US Reply-To: "james.j.sowa" Organization: AT&T Bell Laboratories Lines: 61 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 176, message 3 of 8 In article westmark!dave@rutgers.edu (Dave Levenson) writes: >X-TELECOM-Digest: volume 9, issue 173, message 5 of 7 >In article , stjhmc!stjhmc.fidonet. >org!ddodell@asuvax.asu.edu (David Dodell) writes: >> I was curious if Enhanced 911 can pick up the phone number when you are >> calling from a mobile phone (either cellular or IMTS)? Or is this one of This is from memory and may have changed but probably not to much. First of all E911 means two things: 1) an ability to route the calling number to the proper serving PSAP. This means if one house has Police A and Fire A and the next house has Police B and Fire A the 911 call would go to the primary answerer (maybe police) in this case both calls go to poilce A at the PSAP when it is determined it is a fire call all the PSAP attendant will do is press a button labeled fire and the call will route correctly to the proper Fire department . This function is now being applied to cellular as the next author states. >Here in NJ, I have called my office (we have Caller*Id Service) from >the car. No calling number is displayed (it says: Out of Area). >When I dial 911, who I get seems to depend upon where the car is. >If I'm driving in New Jersey, I reach the NJ State Police. When I >call from New York City, I get the NYC 911 operator. While they may >not get my mobile number, they do make some use of the mobile >telephone system's knowlege of where I'm calling from, probably >based upon which cell site is handling the call. >The above applies to Cellular, using MetroOne in the NYC area. IMTS >and other cellular systems may be different. >Dave Levenson Call routing should be done on serving antenna instead of cell since it would be a finer geographcal area to define. 2) After having the ability to transmit the calling number to the PSAP. The PSAP will then do a database lookup the interpret the ANI DN into an address of telephone of the calling party. This information aids in dispatch, redialing, aiding callers who don't know their location. It is an open item today as what to transmit to a PSAP from a cellular phone and how much information is needed at the PSAP - calling number? 10 digits - serving cell? x digits Besides, if the DN to address translation is done at the PSAP from their database, how could they have all the mobile DNs from all over their area translated into their database. (much less updated.) How would they translate roamers? Jim