Avaya 5621SW H.323

OR

You can give them to a 14-year-old and tell him “I’ll give you $100 to write a program that manages these little turds.”

If he gets a program written that helps you manage the phones, you can make it part of FreePBX and maybe people will be able to manage them from the GUI.

Kind of like that program I’m about 80% done with that manages Chan-SCCP-B (frigging TFTP XML files…)