Exam MS-721 topic 1 question 96 discussion

answer should be ^(1\d{3})$ and +1423555$1

answer should be ^(\d{4})$ and +1423555$1. The question is about 4 digit extension and not 3 digit extension

Sample normalization rules https://learn.microsoft.com/en-us/microsoftteams/what-are-dial-plans#sample-normalization-rules

In Microsoft Teams, you can configure the normalization rule to support four-digit dialing. Here’s how you can do it: Open the Teams admin center. Navigate to Voice > Direct Routing > Translation rules. Click Add to create a new rule. In the Name field, enter a name for the rule. In the Pattern to match field, enter ^(\d{4})$. This pattern matches any four-digit number. In the Translation field, enter +1423555$1. This will translate the four-digit number into the full phone number format. Click Apply to save the rule. This rule will translate any four-digit dialed number into the full phone number format, allowing you to use four-digit dialing in Teams. This solution minimizes administrative effort as it only requires a one-time setup.

The answer can be ^(\d{4})$ and +1423555$1 depending on the placement of the normalization rule since the matching is top down and not closest match first. I have tried both ^(1\d{3})$ and ^(\d{4})$ and whichever is placed at the top matches first. Both result in a E.164 translation. However, translation is the same for both +1423555$1