Exam MS-720 topic 2 question 9 discussion

HOTSPOT -
Your company is migrating from a legacy PBX system to Microsoft Teams.
The phone number range is + 1-423-555-1xxx. The PBX system uses four-digit dialing internally. Extensions are the last four digits of the number.
You need to ensure that you can use four-digit dialing for your numbers in Teams. The solution must minimize administrative effort.
How should you configure the normalization rule? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Suggested Answer:
Box 1: +14235551\d{3}
Need to string away + 1-423-555-1, and keep only 3 digits.
Example:
New-CsTeamsTranslationRule -Identity 'AddPlus1' -Pattern '^(\d{10})$' -Translation '+1$1'
This example creates a rule that strips +1 from any E.164 eleven digits number. For example, +12065555555 will be translated to 206555555
Example 2:
New-CsTeamsTranslationRule -Identity 'StripE164SeattleAreaCode' -Pattern '^\+1206555(\d{4})$' -Translation '$1'
This example creates a rule that strips +1206555 from any E.164 ten digits number. For example, +12065555555 will be translated to 5555

Box 2: +1423555$1 -
Keep the 3 digits. Add one digit with the translation.
Teams phone pattern translation example
Reference:
https://docs.microsoft.com/en-us/powershell/module/skype/new-csteamstranslationrule