Unable to setup a Teams call

Question

Hello Teams Community

Please i need your help on this.

When users are trying to set up a teams call, they get the error message "It seems that we couldn't setup your call due to your network configuration"

When they retry the call setup, the call comes through.

These users are working through a SSLVPN connection, the traffic for Teams is being split at the users, using the following document: https://learn.microsoft.com/en-us/microsoft-365/enterprise/urls-and-ip-address-ranges?view=o365-world...

Is it possible that this list is incomplete? Because we can still see some Teams traffic, originating from VPN users, towards Microsoft IP's that are unlisted in that document.

Answer 1

Hi @IBN ，

Is it possible that this list is incomplete? Because we can still see some Teams traffic, originating from VPN users, towards Microsoft IP's that are unlisted in that document.

As indicated in the document you shared above, endpoint data lists there are requirements for connectivity from a user's machine to Office 365, but there are indeed some additional endpoints which are not included in the list. Furthermore, as mentioned in the article, endpoints data may be updated as needed each month. However, since according to your description, the call can come through when retry the call setup, seems like it's just an intermittently occurred issue rather than an issue with the network configuration about these urls or ip address ranges.

With the above being said, it's suggested to go though the optional network optimization tasks mentioned in the following document and see if there's anything can be improved in your environment:
Prepare your organization's network for Microsoft Teams

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