Cheat code

Emergency cheat sheet

Direct 911. A required prefix fails Kari's Law in the United States.
On-site notification is a second duty.
Callback must reach the site that dialed, not a headquarters receptionist.
Webex and Teams locations are not a CUCM ELIN. Name the product before you test.

Source: FCC MLTS 911 requirements. Other countries have their own rules.

Sources and go deeper

Opened 2026-10. A row marked confirm has no link, because that page was not verified.

Webex. Get started with Webex Calling last checked 2026-10
Cisco. System Configuration Guide for CUCM, Release 15 last checked 2026-10
Protocol and ports. CUCM 15 TCP and UDP port usage last checked 2026-10
Community. Cisco Community, Collaboration knowledge base last checked 2026-10
Wikipedia. Voice over IP (Wikipedia) last checked 2026-10
Cisco. Emergency-calling statute for your country. confirm. No emergency-law page was opened for this block. Confirm the rule that applies where the site is. last checked 2026-10