Use AppleScript to detect incoming calls?
telephonyStatus
and if it is in 'Ringing' status, it is an incoming call alert.
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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