Microsoft Teams hybrid with Skype for Business Server 2019

Question

We currently have Microsoft Teams and Skype for Business Server 2019 in a hybrid configuration.

Most of it is working well, however we have one issue with extension numbers.

Calls between Teams and Skype work fine if the recipient of the call has a DDI ie +442081112222

However, calls between Teams and Skype behave weirdly if the recipient of the call has an extension number - ie +442081234567;ext=1000

• Calls from Skype to a Teams user with an extension go straight through to the users voicemail - even if the user is available.
• Calls from Teams to a Skype user with an extension go through to the voicemail of the Skype for Business user with the lowest extension number!

Has anyone got a hybrid enterprise voice setup working correctly with extension numbers? Any ideas on where we are going wrong?!

Answer 1

Hi @Daniel Loughlin ,

Does this issue only occur on specific users?

Some customers also met the same issue before, so we firstly recommend you go to Teams Admin center and select user that are experiencing the issue and set this user’s coexistence mode to Teams only.

In addition, please check if the receiver has blocked the incoming caller ID. For more details about setting, you can learn it from:

https://learn.microsoft.com/en-us/microsoftteams/set-the-caller-id-for-a-user

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