Cisco and userscontext

I have recently upgraded to 1.4.18 from 1.4.4 and 1 issue i have noticed is on my cisco phone it always forces to the default context even though i use another
any ideas

config in users.conf
[100]
callwaiting = yes
context = inbound-ext
subscribecontext=Extensions
userscontext=inbound-ext
callerid="<100>"
fullname = name
hasdirectory = yes
hasiax = no
hassip = yes
hasvoicemail = yes
host = dynamic
mailbox = 100
secret = password
vmsecret = 100
registersip = yes
qualify=500
callgroup=1
pickupgroup=1
allow=g729,ulaw
canreinvite=no
call-limit=4

Cheers Darren