The CP-7937G IP Phone configured on out network is not powering on with power splitters and power adaptors supplied along with it. It only powers on via the POE port from a POE switch. Cisco TAC supplied all possible RMAs but none of them helped in powering on the phone through Power adaptor / splitter. We also tried to power on the phone using power splitters and adaptors of another brand new CP-7937G phone. Please advice.