Try this one out..
CSCeb37182 Bug Details
Headline Line Text Label Feature Not available on this device
First Found-in Version 3.3(2)ES
First Fixed-in Version 3.3(2)ES32
Symptoms:
Line Text Label filed for all lines on 7940 phones show as "Not available on this device."
Conditions:
Server has 3.3(2)DevPack05 or cmterm-7912g.P009.3-3-2 installed.
Workaround:
Contact Cisco TAC until a permanent fix can be made available