RingCentral Professional™
Missed call notification 
Keep track of all of your calls, even the ones you never answer. Use call notifications to let you know immediately when a call has gone unanswered. Set up your system to send notifications through email, text message, or both.
Control incoming call notifications, so you can return every missed call. To receive notifications for missed calls only:
1) Select Send Notification on Every Call from the pull-down menu.
2) Check the boxes marked Unless the caller leaves a voicemail and Unless I’ve answered the call.
You can also configure your system to forward notifications for any combination of voice messages, fax messages, answered calls, or even all calls.
