Having issues adding three additional AP to the 1852i Controller. I have the primary controller setup on 1 of the AP, but when I connect any of the other 3 1852i APs, the controller is not able to detect it. Following the instructions, it says I could just connect the other APs and ensure it is on the same subnet, and they are.

I am able to access the management page of the controller through a web browser.
All the APs are connected to Catalyst 3560-CX - 12 Port.
My Cisco 7925G phone is connected to the wireless from the controller AP and it is making calls.

Not sure if I missed a step in the setup process to ensure any additional APs I connected to this same subnet will be recognized by the controller.

Any ideas on what I could do to get the other APs to be recognized by the controller?

SierraVista-3560CX_2#show arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  192.168.0.245           -   005f.8696.fac1  ARPA   Vlan10
Internet  192.168.20.1            5   64f6.9d27.8900  ARPA   Vlan20
Internet  192.168.20.6            -   005f.8696.fac2  ARPA   Vlan20
Internet  192.168.20.181        179   0038.df3a.39f0  ARPA   Vlan20  'This is the controller'
Internet  192.168.20.188         29   0038.df3a.4958  ARPA   Vlan20
Internet  192.168.20.218          3   0038.df3a.3bf0  ARPA   Vlan20