Learn step-by-step how to configure an IP phone policy in Microsoft Teams to block GAL access for public area phones while enabling call functionality.
Table of Contents
Question
You have a Microsoft Teams Phone deployment.
You plan to deploy a certified Teams phone that will be in the public lobby area of your organization.
You need to restrict the phone from being able to access the organization’s global address list (GAL). The phone must only be able to make and receive calls.
What should you configure?
Select only one answer.
A. a calling policy
B. a configuration profile
C. a voice applications policy
D. an IP phone policy
Answer
To restrict a Microsoft Teams phone in a public lobby area from accessing your organization’s Global Address List (GAL) while retaining call functionality, configure an IP phone policy (Option D).
D. an IP phone policy
Explanation
Teams IP Phone policies provide the ability to lock down a phone in common area phone mode and restrict what a user can do on the phone.
Key Configuration Steps
Create a custom IP phone policy using PowerShell:
New-CsTeamsIPPhonePolicy -Identity "LobbyPhonePolicy" -SignInMode "CommonAreaPhoneSignIn" -SearchOnCommonAreaPhoneMode "Disabled"
This disables the ability to search the GAL (SearchOnCommonAreaPhoneMode = “Disabled”) and enforces the common area phone sign-in mode125.
Assign the policy to the phone’s account:
Grant-CsTeamsIPPhonePolicy -Identity "[email protected]" -PolicyName "LobbyPhonePolicy"
Why an IP Phone Policy?
Controls device behavior: IP phone policies directly manage Teams phone features like GAL access, hot-desking, and the user interface.
Relevant parameters:
- SearchOnCommonAreaPhoneMode: Disabling this blocks GAL searches.
- SignInMode = CommonAreaPhoneSignIn: Optimizes the device for public use, hiding non-essential features.
Why Other Options Are Incorrect
- Calling policy (A): Manages call-forwarding, delegation, and park—not GAL visibility.
- Configuration profile (B): Configures device-wide settings like Wi-Fi, not GAL restrictions.
- Voice applications policy (C): Governs voicemail and auto-attendants, unrelated to device-level GAL access.
After applying the IP phone policy, sign out and back into the device for changes to take effect.
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