Readiness Testing
2026-02-18
By Ben Carter
Cloud calling rollouts make E911 testing a change-management discipline
Why migration teams need E911 test evidence for pilots, branch conversions, session border controller changes, and user moves.
Ben Carter
VoIP emergency routing writer
VoIP and SIP networks
Ben covers SIP trunks, emergency routing providers, callback handling, nomadic VoIP, and provider selection.
Recent articles
Cloud Calling
2026-06-17
By Ben Carter
Redundancy and connectivity options for emergency routing
What failover design should cover when 911 depends on cloud calling, SIP voice trunks, session border controllers, and provider routing.
Network
2026-05-13
By Ben Carter
Callback number and extension binding for E911
When 911 is dialed, the callback number must help the 911 answering center reconnect to the right caller, not merely ring a main reception line.
PIDF-LO
2026-03-11
By Ben Carter
PIDF-LO in SIP: location conveyance for internet-based voice E911
How PIDF-LO travels in SIP emergency calls, where session border controllers and carriers can break it, and what to test before trusting internet-based voice E911 routing.
PIDF-LO
2026-03-06
By Ben Carter
PIDF-LO explained for E911 location routing
A practical guide to PIDF-LO, the XML location object used to carry civic, geodetic, privacy, and method data in emergency calling workflows.
Cloud Calling
2026-01-12
By Ben Carter
session border controller, SIP voice trunking, and emergency call routing
The emergency-calling checks every session border controller and SIP voice trunk design should include before production.
PSAP Operations
2025-09-30
By Ben Carter
Common E911 failure modes: wrong 911 answering center, stale location, failed callback
A practical failure catalog for enterprise E911 programs and the controls that prevent repeat incidents.
Cloud Calling
2025-04-07
By Ben Carter
Teams emergency calling and E911 in the US
How Microsoft Teams emergency calling should be designed around locations, policies, carriers, and testing.