Can I have multiple phones on the same Internet connection?

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Yes, that is no problem.

The main considerations when having multiple phones on the same connection are the Internet connection speed (the higher the number of users the higher the required connection speed) and the number of ports available on your router.

Some phones, such as the Siemens Gigaset, allwo you to run multiple handsets from one base station, so allowing you to amplify the number of phones you could plug into one router. The Snom range requires a direct connection to the router per phone. If more than four phones are needed youo can consider a switch to increase the number of ports you have available.