unlike selective routing on land lines, most wireless 9-1-1 systems route
calls to a specific call center for a large regional area. in some areas
out west the call center operator may be hundreds of miles away.
exceptions are large cities and a few areas that have implemented wireless
selective routing. selective routing on your land lines allows for 9-1-1
calls to be directed to the specific answering point for your jurisdiction.
imagine that you live in city X and your next door neighbor lives in the
unincorporated county just beyond the city limits. with selective routing
when you dial 9-1-1 your call is directed to the city police but when your
neighbor dials 9-1-1 his call is directed to the sheriff's office. wireless
selective routing works in a similar fashion based on tower locations. most
wireless 9-1-1 systems route calls to a single answering point. and as jim
correctly pointed out when the wireless 9-1-1 call is answered the operator
first determines the location of the incident and then transfers the call to
the proper jurisdiction. in my home county all wireless 9-1-1 calls are
first routed to the sheriff.
9-1-1 calls are routed on special trunk lines which enable ANI/ALI data
(ANI=automatic number identification, ALI=automatic location information)
and are not translated to a standard 7-digit phone number. while some 9-1-1
call centers and police agencies may still maintain a standard 7-digit
number for use by the public many more do not. my center discontinued all
public 7-digit numbers 20-years ago. the police and fire agencies in my
home county have business numbers available to the public but someone
dialing that number in an emergency will end up being transfered to the
9-1-1 call center. and while that caller will reach the proper operator
that operator will *not* have the ANI/ALI data to fall back on if the caller
is disconnected. using a 7-digit number to contact police, fire and EMS in
an emergency may actually slow the response and deny the 9-1-1 operator
critical ANI/ALI data.
___________________________
You really need to check in your area where a 911 call goes from a cell
phone. Here in California, cell phone calls will probably wind up at a
California Highway Patrol call center in Sacramento. Then they will have to
figure out where you really are and transfer it to your local call center.
What I have done is to find out the local number that reaches the 911 call
center here in San Francisco and set up a contact called Nine One One with
that full local number. That way I get immediate response here in SF. I have
used it once, and it does work.
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