Do much more
Snom phones are by far the best choice if you want to do anything more than just call. They have the most extensive list of features, and multiple ways to integrate with other functions. The phones can be controlled and configured remotely, and they can communicate with other devices and services via http requests.
Some examples
Things you could do in combination with other services or devices
Even more examples
To show off the capabilities
Make your phone dial out
An alarm system can trigger your office phone to dial out to your GSM is speaker mode. You can listen and speak in the room
View IP cameras
Put the door videophone images on your phone whenever the bell is rung, or dispay video from a security camera
Open the door
With a push on one of the programmable buttons
Display information
Display the room temperature on the bottom line of the display
Control the room
Change the target temperature, lighting, and audio volume on the display of your phone
Notify important missed calls
Send an email containing the phone number whenever you miss an important call