The seller explicitly states SIP protocol/device but omits that this device is factory set up for use with Cisco's proprietary CUCM and cannot be used /setup for anything else. Will have to return this, unusable...

This seller does not seem to regulate which region the items are designed for, so you're playing roulette with which power supply you'll end up with. I ordered 6, and all of mine shipped with European power supplies which do not fit in North American outlets. They are all useless to me until I can purchase another power supply.I happened to have 1 power supply on hand from a previous installation and was able to confirm that the hardware works fine.