Obviously since the phone might exist on a set of DID numbers that point to a physical address, how do you handle the fact that phones can go with the user anywhere... including remotely over VPNs or private networks?
You must emplore a Signaling Gateway, that bridges the gap for your VoIP gateway and the TDM (Usually via a Softswitch)
By deploying a Signaling Gateway between the VoIP gateway and the 911 tandem, the 911 call can be directed by the MGC (or service control platform) to the appropriate 911 tandem. By establishing a clear path using a distinct IP address and UDP port, the Signalin Gateway communicates with the media gateway and associated call control messages from the MGC over IP. A Signaling Gateway takes the IP connection control messages associated with E911 call and incoming E911 bearer traffic, and transforms them into MF R1 to make them appear completely transparent to the 911 tandem.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.