[cisco-voip] 911 Sanity Check

[TechGuy]

I am having the worst time dealing with our telco SP and 911, because of
this I have to reach out to others and find out if I am simply asking for
too much or if there is a major deficiency on the part of our telco
provider.

Here is the basic issue / scenario I am dealing with.

Business with about 10 different offices spread out in 10 different
locations / rate centers.

Four PRI's all coming into one data center, and using CallManager to manage
gateway and phones.  This isn't really a technical issue related to
callmanager as much as its an issue with the PRI's and 911

The PRI's have 600 DID's all in one range and tied to the telco rate center
in which the data center is located.

Obviously the data center and the offices are not the same and like I said
in many different rate centers.

So I have employees with a number that does not accurately represent the
location they are in.  For arguments sake and in an effort to paint a
clearer picture here, lets say the data center is in Dallas and the DID
range is say 972-453-1000 thru 1599

And say I have an employee at an office in Houston, but his number is one
falling into the range above.

Where this becomes an issue obviously is with 911.  I thought there would or
should be a way through e911 or something to provide a list of numbers and
the office they should be tied to.  Say I have setup a group of 100 numbers
from my above range to belong to my Houston office.  It would seem that
there would or should be a way to have that group of numbers setup to
reflect the correct address and route to the correct 911 center.

Maybe I am sadly mistaken here and this is not something that can be done or
can but not by all service providers or something?

My other option obviously is to place a local gateway at each office and get
a local pots line tied to it and setup callmanager to route 911 calls
through this gateway for the phones in that particular office. I know I can
do this, but it really takes away from the whole voip cost savings by
increasing my need for new hardware.

So, who can help me understand this?  Is this a limitation of the my telco
service provider if they are saying they can't do this and that I have to
have numbers on the PRI tied to each rate center?  Because thats where I am
right now, telco is telling me I have to get numbers or DID's for each rate
center and use those for each of my offices.  Which to me would just be a
major admin nightmare.  I would have very inconsistent ext. ranges and such
all over the place.

Love to hear some thoughts.  Tell me I am crazy and expecting too much,
missing some obvious point, I can take it.  :-)  I just need to know good or
bad what the deal is.

Appreciate all your time and thanks for any responses in advance.
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