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Personally I would use the 7100 for DHCP over the Linksys devices. I believe you can go into network settings on the adtran phone then to server menu and set the ftp server that you would have used for option 157 with credentials.
I believe that your port configs will work too.
I agree with natem. Been where you are and it was MESSY trying to have multiple DHCP servers and scopes. Unless you are installing less than 10 phones, I would not consider static, and just move everything to the 7100.