Free services are rarely HIPAA compliant. You need that BAA for a service like google voice. Also those transcriptions are "researched" to make their transcription more accurate.
there is an option that says if this is an urgent or emergent matter only you can hit option 4. Then option four basically repeats that you should only use this option for urgent/emergent matters only and then you can call Dr. Mody on his cell phone at XXx-XXX-XXXX. The number we list is not directly my cell phone but a google voice number that we forward to my cell phone. There is a google voice app downloaded on my phone.
You can also program phone systems to dial an outside number or a lot of VoIP systems have an app that will let you receive and dial out calls using the office number instead of giving people your straight cell number.