Friendly reminder to anyone who installs or maintains PABXes: test your emergency calling whenever you make change.

In Australia, you can call 000, say you’re testing a phone system, read out the Caller ID you’re supposed to be calling from, and they’ll confirm the number and location. This happens with the 000 operator, not the police/fire/ambulance operator you get transferred to in a real emergency.

Other countries may have different testing procedures.

In the U.K. you should email 999testcalls@bt.com first, although strictly speaking for a one off test (typically by an end user rather than a professional) it’s ok to just call and explain.

https://www.ofcom.org.uk/phones-and-broadband/telecoms-infra...