The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Electric Power Board of Chattanooga:
EPB Hosted UC is a softphone add-on to the EPB Hosted Phone Solution platform of products. It integrates voice telephony with other communications technologies into an intuitive user interface. Features include: Presence and IM: Shows which contacts are available, offline, or idle. Users can message individual users, multiple users or departments. Voice Calls: Make phone calls directly from your mobile device using your EPB Hosted Phone business number.IMPORTANT NOTE: Users are required to have a Hosted Phone Solution VoIP account with EPB Fiber Optics to make calls.