Deploying MS Teams Direct Routing with IP Office

Numbers to Consider

Last Updated : Oct 16, 2023 |

Begin planning by considering the different numbers used on or routed through the IP Office:


Dialed Numbers		Details
Extension Numbers	IP Office	These are 3-digit numbers in the range 200 to 299. The scenario uses these for IP Office only and MS Teams+IP Office users.
Extension Numbers	MS Teams Only	These are 3-digit numbers in the range 400 to 499. The scenario uses these for MS Teams only users.
IP Office Short Codes		These are numbers of variable length but always beginning with *.
Incoming PSTN Calls		The customer's main number for calls to the IP Office is 01632 768000.
Emergency Calls		999 and 112.
PSTN	Local	Any 6-digit number.
	National	7 to 10-digit numbers with a leading 0.
	International	Numbers beginning 00.

There are special scenarios to consider for calls made by MS Teams users:

We need to convert any calls from MS Teams prefixed with a +:
- Change the + to the international dialing prefix for the customer's locale if the country code is not 44.
- Remove the + or 00, and the country code, from calls that are national calls.
- Remove the + from any other numbers.
We want calls prefixed with the country code 44 changed back to being national numbers with just the national dialing prefix.

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