Can an iPhone act as an audio source to a Mac? Is there a way to pull the audio from an iphone phone call to a mac either via bluetooth or USB? In other words, use the mac and a cellular phone hybrid?  I'd like to be able to record a phone call or voice mail to the mac.  

I realize i could do this many other ways including using an true phone hybrid, but I'd like to keep the amount of equipment i have to take when traveling.

I'm sure i could also use a TRRS Y cable from the headphone/mic jack into my mac, but i'd also like to keep it in the digital realm.
Yes, you can do it, but you would require some professional paid apps for it like blue phone elite or phone amego.