You need to provide Microsoft Teams users with the ability to perform PSTN calling through a Session Border Controller (SBC). Which licenses can you assign to achieve the goal?

Question

Options

• AMicrosoft 365 E3 or Microsoft 365 E5
• BMicrosoft 365 E5 or Office 365 E5
• COffice 365 E3 or Microsoft 365 E3
• DOffice 365 E3 or Office 365 E5

• B
  85% (23)
• C
  11% (3)
• D
  4% (1)

Explanation

Option B is correct because PSTN calling via Direct Routing through an SBC requires the Phone System license, which is bundled into both Microsoft 365 E5 and Office 365 E5 at no additional cost - making either sufficient to enable the feature.

Why the distractors are wrong:

• A (M365 E3 or M365 E5): Microsoft 365 E3 does not include Phone System; it would require a separate Phone System add-on, so E3 alone cannot achieve the goal.
• C (Office 365 E3 or M365 E3): Neither E3 SKU includes Phone System - this option has no valid license for the task.
• D (Office 365 E3 or Office 365 E5): Office 365 E5 works, but Office 365 E3 has the same problem as all E3 plans - no Phone System included.

Memory tip: Think "E5 = Everything 5-star" - only the E5 tier (whether Microsoft 365 or Office 365 branded) bundles Phone System, which is the non-negotiable prerequisite for Direct Routing through an SBC. If you see E3 paired alone without a Phone System add-on, eliminate that choice.

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