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Question 128 - MS-721 discussion

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You have a Teams Phone deployment that uses Direct Routing on a single Session Border Controller (SBC).

Users report that outbound PSTN calls are failing, but inbound PSTN calls are successful.

When you review the SBC logs, you discover that Microsoft is responding to SIP option requests, but is NOT sending SIP option requests.

What is the cause of the issue?

A.

The online PSTN gateway is disabled.

Answers
A.

The online PSTN gateway is disabled.

B.

An SBC certificate is expired.

Answers
B.

An SBC certificate is expired.

C.

An external DNS entry is missing from the FQDN of the SBC.

Answers
C.

An external DNS entry is missing from the FQDN of the SBC.

D.

The phone numbers of the users are defined by running the New-csTeamsUnassignedNuirtoer Treatment cmdlet.

Answers
D.

The phone numbers of the users are defined by running the New-csTeamsUnassignedNuirtoer Treatment cmdlet.

Suggested answer: A

Explanation:

Issues that affect outbound direct routing calls

You might experience various issues when you use Direct Routing to make outbound calls from a Microsoft Teams client to a Session Border Controller (SBC). These issues include the following:

An incorrect caller ID is displayed to the call recipient.

A connection to the SBC is not established.

Some users in a tenant are unable to make calls.

No users in a tenant are able to make calls.

No users are able to make calls

If none of the users are able to make calls, the calls are probably not reaching the SBC. Check for one of the following causes.

Cause 1

Teams has a disabled gateway.

Resolution 1

Use the Microsoft Teams admin center to make sure that the gateway that's used by Teams is available and enabled.

Reference:

https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/phone-system/directrouting/issues-with-outbound-calls

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asked 05/10/2024
Alvaro Peralta
24 questions
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