Add a phone number to your ring order to answer calls using them. For example, you can add your mobile phone number to answer calls through your mobile phone carrier. You can also add a coworker's phone number so that they can receive and answer your incoming calls. Combined with the ring order, ring duration, and ring group settings, you can create intricate ringing layouts for incoming calls.
Note:
The ring duration for the phone numbers you add is set to 4 rings or 20 seconds by default.