[VoiceOps] 911 Database Stuff

[Mike Hammett]

Our NG911 seems to work the same way as traditional E911, just over SIP instead of TDM. 


----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 



Midwest Internet Exchange 
http://www.midwest-ix.com 



From: "Nathan Anderson" <nathana at fsr.com> 
To: "Mike Hammett" <voiceops at ics-il.net> 
Cc: "voiceops" <voiceops at voiceops.org> 
Sent: Tuesday, October 18, 2022 7:17:42 PM 
Subject: RE: [VoiceOps] 911 Database Stuff 



I still am not completely up to speed on the NG911 stuff admittedly, so take with grain of salt & whoever is in the know please educate me, but... 



My understanding has always been that E911 database cruft is not a big deal because each E911 aggregator essentially maintains their own database, and the lookups are done at the time of the 911 call & the source of the call is taken into account (however the carrier is trunked to the E911 SP; e.g., the particular SIP peer if trunking between carrier and E911 provider is done via IP), so even if two carriers use the same E911 aggregator and have conflicting entries for the same TN in their database, the correct address will still get sent to the PSAP, because the query that's executed isn't merely "where TN = xxx" but is the equivalent of "where account = yyy and TN = xxx". 



For NG911, wasn't pre-provisioning & a central(-ish) database done away with anyway, with the address being transmitted by the endpoint itself at the moment it places the call? (Not sure how or if this works with circuit-switched/SS7, but at least with SIP I think the endpoint just transmits it as an XML payload in the SIP INVITE, or something along those lines.) 



-- Nathan 




From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of Mike Hammett via VoiceOps 
Sent: Tuesday, October 18, 2022 3:22 PM 
To: voiceops at voiceops.org 
Subject: [VoiceOps] 911 Database Stuff 





Going through a migration from E911 to NG911, I've been peering into what and how we do 911, both old and new. 





A) Not all services have a web UI for you to make changes. Intrado does, but the new one does not. Only way is to upload SOI files. I guess we gotta figure out how to do that. 


B) We have more entries than we have TNs. 


C) People are bad at documentation. 





I'm assuming we should be deleting records for customers that disconnected service. I'm not sure we've done that, based on the records that I see. 


For customers that port away, I'm assuming we're supposed to be unlocking the TN for the new provider to take over the record. 


If I unlock it, but the new provider never migrates away, what do I do with it? 


What happens if a provider inserts a duplicate record? 







----- 
Mike Hammett 
Intelligent Computing Solutions 
[ http://www.ics-il.com/ | http://www.ics-il.com ] 



Midwest Internet Exchange 
[ http://www.midwest-ix.com/ | http://www.midwest-ix.com ] 






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