Just a little back ground here. I upgraded CM to 7.0(2) over last weekend. A week before I did the upgrade, I upgraded all the phone firmware to 8-4-4 and upgraded all the voice gateways to 12.4(22)T. All phones functioned fine with the new firmware along with the gateways. Once the upgrade was done on CM, it's default firmware was set to 8-4-3 so it downgraded all the phones. I would like to know how to upgrade just a few phones back to 8-4-4 without doing all of them. How do I do that? The reason I want to do this is echo on incoming calls from customers. There wasn't echo when we were on 8-4-4. This started after the phones were downgraded to 8-4-3. Can the firmware cause echo?