Appropriate to call seller?

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I've been researching potential properties to turn into my first rental property. In so doing, I think I've located a SFH that an out of state investor purchased and started to rehab but maybe ran out of money before it was complete.

My question is, in my research I think I found the sellers number.  Is it appropriate to call the seller and try to get information/details/pain points directly from him, or go through the standard channel of the listing realtor?

Thanks for your help!