I am a German Student working on my Bachelors thesis for Wireless IP Telephony. I have some basic question: Do I need something like the WLSE Express for my environment to enable roaming between the different APs?
I have four Aironet 1200 APs but no wireless controller. (there is no money for that)
So is it possible to roam without any controller?
Sure. You could setup WDS on the AP's and use a local radius server on one of them. With this setup you then could use CCKM and take advantage of fast secure roaming.
You will be able to roam between AP's even without WDS but with each roam you will do a full reauth.