The phone service and you have to have a Business Associate Agreement between you. 4. Return your voice messages through the system – When you are returning a call you need to have the system show a caller ID, it should show your Virtual Phone Number to your client not your cell phone, home phone or other number you call from. 5.
d. Utilizing Ambiguity Over Clarity: When setting up your voicemail greeting be direct and to the point. Tell callers your information, a brief greeting, and direction—i.e. “Hi, this is Jim Shamalam (from Iron Industries). Sorry I can’t take your call right now. Please leave your name number, and a brief message and I’ll get back to you as soon as possible. Thank you.” This is ideal, as you inform callers and let them know what they should do to ensure a return call. A lack of direction can lead to callers leaving incomplete messages (lacking contact or other information) or even callers hanging up without leaving a message altogether.

I am currently away from the office and will return on . This voicemail box will not accept messages during my absence. If you need assistance before I return, please call [Dr. XXX] at 866-305-____ or extension ____. Thank you. Feel free to copy any voicemail greetings, and leave your own suggestions in the comments section.
Expanding on the simple approach above, let the caller know who they've reached. This will not only eliminate people leaving voicemails by mistake, but it will reassure the caller that they have called the number they intended.