[Asterisk-Users] 911/Emergency calls + Caller ID

[Dylan VanHerpen]

Dylan VanHerpen wrote:

> Now that I reed it back, I can barely make sense of it myself! Anyway, 
> I was just thinking out loud, the example wasn't meant to be parsed. 
> Asterisk would need some lower level changes to parse the extra field 
> holding the location information, and to apply the routing rules to 
> substitute the Caller ID name for the location. I was hoping this 
> would be thought provoking for somebody smarter than me :)
>
> > Bumping calls to clear a path for 911 is possible within Asterisk 
> already - see the "SoftHangup" application.
> That sounds good, but what can trigger the SoftHangup app to drop 
> other calls automatically when 911 is dialed?
>
> Thanks, Dylan.
>
> John Todd wrote:
>
>> I'm not sure I can parse your examples correctly.  I'm not being 
>> snide, but do you use Asterisk on a regular basis?  Do you understand 
>> how applications work, and how call handoff is done between Asterisk 
>> servers?  Your example doesn't seem to make sense, no matter how I 
>> think about it.
>>
>> Of course, the problem with 911 is the problem of location of the 
>> originating handset.  That much has been clear for years.  Getting 
>> that information to the 911 call center is the problem; it's pretty 
>> much worthless info even if you have it inside the PBX - you could 
>> just as easily have an external database that maps extensions to 
>> locations - why bother with the PBX if there is no in-band signalling 
>> to the PSAP?
>>
>> This makes me think a bit about some other 911 ideas I had a while 
>> back, using lat/lon/altitude.  Can ADSI tones be transmitted through 
>> "any" phone call on the PSTN?  It might be interesting for PBX 
>> systems to pass across the lat/lon/altitude of callers via ADSI 
>> in-band.  This will never work, of course, since nobody would trust 
>> the transmitters.  The 911 question almost instantly spins into a 
>> political issue, and not a technical issue, since there are a number 
>> of clever ways to solve the problem but not a number of clever ways 
>> to bang solutions into people's heads.
>>
>> Bumping calls to clear a path for 911 is possible within Asterisk 
>> already - see the "SoftHangup" application.
>>
>> JT
>>
>>
>>> Problem: 911 calls placed through Asterisk are associated with the 
>>> physical location of where the CO trunks terminate. This is not 
>>> really a problem when all extensions are located in the same 
>>> building, but when Asterisk is used in a campus-like or otherwise 
>>> networked environment, it can get messy.
>>>
>>> A common solution is to install a few analog lines at each location, 
>>> for emergency calls only. But by making clever use of Caller ID (and 
>>> adding a 'location' field to extensions.conf), it should be possible 
>>> to  properly identify the location of the caller:
>>>
>>> exten => 1001,1,John Doe,1223 Bell Ave. Room 51
>>>
>>> For this to work, you would have to be able to apply rules to the 
>>> 911 context in a dial plan, to replace the *name* portion with the 
>>> *location* portion.
>>>
>>> A similar rule could be defined to drop other calls if 911 is dialed 
>>> and all lines are busy (e.g. drop the lobby phone but not the front 
>>> desk, or drop local vs. long distance, caller ID calls vs. 
>>> non-identified calls, etc.).
>>>
>>> Getting lengthy, better stop.
>>>
>>> Dylan.
>>
>>
>>
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>
>