[VoiceOps] 911 address policy for company phones at home

[Jay Ashworth]

Before I get into my reply, I will point out that the OP is inquiring
about this stuff specifically as it regards *extensions on a PBX which
his company hosts as a vendor to/agent of the end user whose employees'
phones are in question here.  I think that materially affects the answers,
but IANAL.

Anyway...

----- Original Message -----
> From: "Nathan Anderson" <nathana at fsr.com>

> I'm also not sure how you propose to bind E911 details to a device
> instead of a telephone number. The few E911 services I've looked at
> all only give you the option to provision E911 information via TN. So
> if you propose a set-up such as what is being discussed here, where
> each company phone only has an internal extension # and no DID, and
> CLID is uniformly set to a single number for all outbound calls from
> any phone whether it is located in the office building or at an
> employee's residence, then there can only be a single E911 address for
> all of those phones.

And indeed, there used to be such an exemption for office PBX type
installations; I do not remember whether it's expired, but I think
so.  There was quite a bit of third party activity in the "patching
around your PBX to send remote extension building locations to the
PSAP" space at the time...

> The only other kludgey workaround I can think of that might pass
> muster would be to assign unique "throwaway" TNs to each individual
> extension that you would use as the CLID for outbound from that
> extension *only* when 911 is dialed, and continue to use the global
> office TN as CLID across all extensions for all other outbound calls.
> It's not a perfect solution, since if the individuals using those
> phones have no clue about those numbers, they might get confused when
> asked to verify their own telephone number by the PSAP and the
> dispatcher reads some number back to them that isn't their main office
> number. At that point, you might as well let the customer know that
> these numbers exist and give them the option of using them as DIDs for
> the extensions/devices they've been assigned to.

The "Emergency CNID", yes; FreePBX has this, and can be taught what are 
emergency calls; when it recognizes one, it sends a different CNID out on
the "trunk".

I believe that PSAPs have a protocol for dealing with this sort of 
situation, where a note can be put in the LIDB saying that this ANI is
at a physical location and the phone may be labeled with a different 
number, but I am not a PSAP operator, so I might be wrong on this.

Cheers,
-- jra
-- 
Jay R. Ashworth                  Baylink                       jra at baylink.com
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates     http://baylink.pitas.com         2000 Land Rover DII
St Petersburg FL USA               #natog                      +1 727 647 1274