Just a heads up on Cisco PoE, sometimes when you unplug a PoE phone and then plug it back in too quickly, the Cisco switch doesn't release shut the power on the port. You may need to go into the switch and do a "shut/no shut" on the interface. But I have a 3560 PoE and a i2004 and we did not need any other adapter.
You may need to turn off the PoE on the Cisco side to bring these up. Try just plugging in the power supply to the phone, with out the network connection, to be sure the phone actually comes up. If it does, turn off the PoE on the Cisco side and connect
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