On Fri, Jan 18, 2013 at 2:04 PM, Nathan Anderson <span dir="ltr"><<a href="mailto:nathana@fsr.com" target="_blank">nathana@fsr.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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. That seems inescapable. Are you saying that there are E911 companies that can provision differently, and not use the CLID as the "key" to looking up an address? What do they use/how do they work, and can you name some names?<br>
</blockquote><div><br></div><div>We use a third party to support 911 for us, and they take care of the network details based on the CLID we deliver on a specific call. They route to a local PSAP according to the address we've put in their system, not the NPA-NXX of the CLID. In our system, we have two variables for each SIP device; the e911 provider and the e911 CLID/ANI. So on the system side we have granularity down to the device if desired.</div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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.</blockquote>
<div><br></div><div>We sometimes do this if the situation requires it, and I wouldn't call it kludgey. We do process calls into that number in a normal fashion, directly to the extension.</div></div><div><br></div><div>
A related discussion in this: What do most of you tell your customers about testing 911 on their new phone system?</div><div><br></div>-- <br><div>Carlos Alvarez</div><div>TelEvolve</div><div>602-889-3003</div><div><br></div>