On occasion, Tandem cannot use the full internet to connect our calls properly. This may be due to network or computer configuration, and we will alert you when this situation is detected.

If you are able to make changes to your networking setup, the following steps can help improve your call quality.

Tandem will use TCP to connect to the following hosts for data:

https://api.tandem.chat/*

https://tandem.chat/*

Tandem will use TCP and UDP to connect to the following hosts for media:

https://*.av.tandem.chat/*

https://*.twilio.com/*

Tandem will use outbound UDP ports 10,000 - 20,000.

TCP will be used if these UDP ports are blocked, which can degrade overall call quality for all participants.

For additional information on optimizing your network configuration, please see Google's recommendations for Meet: https://support.google.com/a/answer/1279090?hl=en

Preparing your network for Tandem calls

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