A company has configured Direct Routing with an SBC. They notice that calls sometimes have one-way audio. The SBC is behind a NAT and uses a public IP address. Which setting on the PSTN gateway should you verify?

The 'Gateway' FQDN matches the SBC's external FQDN and the SBC is configured to use the correct external IP for media.

The 'Media bypass' setting is enabled.

The 'SIP transport protocol' is set to UDP.

The 'Call park' setting is enabled on the gateway.

A company has Direct Routing configured. They run 'Test-CsDirectRouting' and it passes. However, when a user makes a call, it fails. The SBC logs show '404 Not Found' for the called number. What is the most likely cause?

The user is not assigned a phone number.

The SBC is not registered with Teams.

The SBC's certificate is expired.

The voice routing policy does not have a route that matches the called number pattern.

A company is configuring Direct Routing and wants to ensure that the SBC only accepts connections from Microsoft's Teams Phone service. What should they configure on the SBC?

A firewall rule that only allows traffic from Microsoft 365 IP ranges on the SIP signaling port.

A username and password for SIP authentication.

A TLS certificate from an internal CA.

An organization is setting up Direct Routing. They have two SBCs in different regions for redundancy. They need to create a PSTN gateway in the Teams admin center. What is the correct approach?

Create a single PSTN gateway and add both SBC FQDNs to it.

Create one PSTN gateway using a virtual IP that load-balances between the SBCs.

Create two PSTN gateways, one for each SBC FQDN.

Create one PSTN gateway and configure the second SBC as a backup in the gateway's settings.

A company is configuring Direct Routing. They want to ensure that media traffic is encrypted and that the SBC only accepts media from Teams clients. What should they configure?

Use a VPN tunnel for all media traffic.

Enable TLS on the SIP signaling and rely on that for media encryption.

Enable SRTP on the SBC and configure the firewall to only allow media traffic from Microsoft 365 IP ranges.

Configure the SBC to use TCP for media.

Microsoft 365 Certified:Collaboration Communications Systems Engineer Associate

Domain 3Objective 6

Configure and Manage Direct Routing for Teams Phone MS-721 Practice Questions (Page 5)

Part of the Implement and configure Teams Phone domain, which accounts for 30–35% of the MS-721 exam. Microsoft does not publish an official question count, but from its 100-minute exam (~40–65 total, ~12–23 in this domain), expect 2–4 from this objective — we provide 34 practice questions to prepare you well beyond it. (estimate)

34questions here

7free pages

6concepts

30–35%of the exam

Questions 21–25

21application · medium
A company has configured Direct Routing with an SBC. They notice that calls sometimes have one-way audio. The SBC is behind a NAT and uses a public IP address. Which setting on the PSTN gateway should you verify?
Select an answer first
22expert · hard
A company has Direct Routing configured. They run 'Test-CsDirectRouting' and it passes. However, when a user makes a call, it fails. The SBC logs show '404 Not Found' for the called number. What is the most likely cause?
Select an answer first
23application · medium
A company is configuring Direct Routing and wants to ensure that the SBC only accepts connections from Microsoft's Teams Phone service. What should they configure on the SBC?
Select an answer first
24application · medium
An organization is setting up Direct Routing. They have two SBCs in different regions for redundancy. They need to create a PSTN gateway in the Teams admin center. What is the correct approach?
Select an answer first
25expert · hard
A company is configuring Direct Routing. They want to ensure that media traffic is encrypted and that the SBC only accepts media from Teams clients. What should they configure?
Select an answer first

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