Using a PoE switch, 'show cdp entry XXXX" for a 7961 shows 6.3 watts.
Platform: Cisco IP Phone 7961, Capabilities: Host Phone
Interface: FastEthernet0/21, Port ID (outgoing port): Port 1
Holdtime : 179 sec
Version :
SCCP41.8-2-2SR1S
advertisement version: 2
Duplex: full
Power drawn: 6.300 Watts
Power request id: 50716, Power management id: 3
Power request levels are:6300 0 0 0 0
Management address(es):