Body language, facial features, & tone of voice will help get a sense of what the person you're talking to is really feeling. 

I thought real buyers would answer the phone, and Gurus let it go to voice mail.Joe Gore

Now the service will record calls but doesn't offer voice mail.

When you listen to peoples voicemails and hear their tonality you can hear the motivation or lack thereof in their voice on occasion...

@John BakerI coach people full-time and I think the biggest mistake is "to piss off a seller with the voicemail," I don't care if you use ringcentral or Google voice, a motivated seller when they call needs a professional to listen to them. 

I have listened to both of your podcast and followed your filtering questions religiously (along with my best attempts at positive and negative reinforcement with my voice).  

During that process, I also collect other necessary information from the tenant, such as vehicle registration & description, emergency contact, telecommunication contact details (voice phone, text phone, email), options for paying rent (direct deposit, auto pay, mail), ways to contact us (voice phone, text phone, email).While the unit is vacant, prior to turning over possession of the unit to the tenant, I fill out the Property Condition Report, noting any deficiencies known to me.

Good 'ol Google Voice.

I'm letting everything go to voice mail. 

They have super nice postcards, innovative "zip letters" and of course LETTERS.