RingOS - Feature Request

I have about 60 customers that are continually asking me about thier Voicemails having the ability to show up on all of their desk phones in their office and if they delete the Voicemail from one of their desk phones it removes it from all other desk phones.

Currently I have the Voicemails copying to everyone's extensions but if they delete the voicemail on one of the users phones it doesn't remove it from the rest. This is causing the issue where multiple people in the office are calling back the person back regarding a voicemail they left and their customer responding with "We already spoke with someone from your office and we are taken care of".