As of this month, you can no longer buy analogue lines. The Public Switched Telephony Network (PSTN) will be closed down in 2025 so you must ensure you migrate to IP-based systems before the mad rush starts.
In office buildings you will typically need to check for:
Lift emergency phone lines
Alarm systems that call back to a security company
Credit/debit card machines
Also, make sure your VOIP phone system is correctly configured for when a 999 call is placed.
コメント