Aastra sent me a pair of IP phones to help with a customer demo and I've had a few issues setting them up. I suppose it helps if you read the #$@#$ manual but working with beta software/hardware doesn't always yield the same easy to read, or readily available docs.
Anyway, here are a few tidbits to help you along the way:
DHCPUtil.exe: This utility will help you configure your DHCP options for the Aries (Wave 14) IP phones. You need to configure several new DHCP options in order for the phone to work properly. You will find this utility in the \support folder of your W14 media. Using the following syntax, the utility will configure the options for you (highly recommended): DHCPUtil.exe -sipserver
NOTE: You need to run the above utility on your Windows DHCP server. If it's not an x64 OS, you need to install the "vcredist_x86" from the W14 media.
How to do a hard reset: Hold down the "#" + "4" + backspace keys and plug in the phone. Keep them held down until you see a screen asking if you want to reset the phone.
How to test the phone's bootstrap process: On your Communications Server front-end server, open PowerShell and run: "Test-CsPhoneBootStrap -PhoneOrExt