In this scenario, the customer has a single ASBCE and IP Office.
IP Office extension numbers in the range 2XX. MS Teams only user extension numbers in the range 4XX.
Local area code 01632.
Main telephone number 01632 768000
The customer is based in the UK, international dialing prefix 44.
The customer wants to be able to restrict which MS Teams users can make outgoing national and international PSTN through the IP Office.