Immediate hangup as soon as I answered. Searches show it's a VoIP call.

The "UNBOUND" telemarketing company has used the Caller ID UNBOUND number for Fraternal Order of Police solicitations , Solar panel sales, and others.

Here's what Google's cache shows about the unbound.us site:
Quote: We are the first and only independent systems integrator exclusively focused on
the marketing technology landscape. If you share our belief, that programmatic buying
and selling is the future of media, we should talk. We configure and build audience trading
systems that dramatically improve business results by bringing together media
owners and brand marketers on equal terms.

   jobs@unbound.us
       info@unbound.us
       invest@unbound.us