If you ever find yourself missing calls from Telegram after uninstalling Beeper, consider the following:
 

1. In your Telegram Native App
2. Select Settings
3. Select Devices
4. Select Active Sessions
5. Select Beeper Bridge Server
6. Toggle Off → Accept Calls
7. Toggle Off → Accept Secret Chats

This will ensure that in the event Beeper may be interfering with these options, you can ensure you have disabled them and Beeper is not affecting Telegram.