I have LMS3.1 (campus 5.1.0)
UT do not discover ip-phone when they are connected to interface with port-security. But UT discover ip-phone when the interface are setup without port-security.
Here you can find switch config:
-port 1/0/38: no port security
-port 2/0/38 : port-security
-> Ip-phone not discovered
Allthough the "sh mac add" on the switch show the ip-phone behind port 2/0/38