im having trouble getting more than 20 Nortel 2211 wireless phones working at on time. i have plenty of key codes, enough for 58 only need 32. Once i have 20 of them up and running i get "NO PBX RESPONSE". i can see the phones on the network through pings and watching our TFTP server. just wondering if anyone had an idea of what my problem could be. ive been on the phone w/ nortel but as per usual they wernt much help.