Teams Phone number porting checklist

Overview

Number porting (LNP) is calendar-driven paperwork plus technical validation. Miss a FOC date and you strand users between carriers.

Pre-port

• Gather CSR (Customer Service Record) from losing carrier; validate BTN and account PIN.
• List every TN (DID), toll-free, and analog line; flag fax and alarm circuits early—they may need alternate paths.
• Confirm E911 addresses per location in the Teams admin center match PSAP expectations.

Order hygiene

• Submit LOA with matching legal entity name; signatory matches authorized reps on file.
• Coordinate temporary forwarding if gap risk; never promise zero downtime on complex trunks.

Cutover window

• Freeze auto attendant and hunt group changes 48 hours pre-FOC unless emergency.
• Post-cut: place test inbound/outbound, 911 test per local policy (coordinate with PSAP where required), verify SBC cert chains healthy.

Documentation

Store carrier tickets, LOA PDFs, and FOC confirmations in the client compliance folder; note CSR snapshot date for audits.