All, Aruba Access points support a couple of different modes and a few different traffic tunneling options. A thin port/ dependent AP is called a campus AP while an AP deployed in the remote office can be configured as a Remote AP. Remote AP has limited site survivability that Campus APs don't. AP6x, AP7x, AP9x, AP-10x, AP12x can be setup as a campus AP or remote AP. I will talk about RAPs in a separate post pending more testing. Traffic tunneling option controls the flow of traffic. Traffic can either be centralized to the switch or bridged at the edge. There is also a split tunnel mode, where the user configures the network destinations that need to be centralized and the rest is bridged at the edge. Most Aruba features are applicable only when traffic is centralized through the switch. Here is a list of features that require a controller and will not work in say local bridging mode in a campus AP or a Remote AP. For simplicity I am using Aruba feature names straight out of the product. Compare this with Wi-NG 5.0 feature set where all features are available even when wireless switch controller is not in the data path. Of course, wireless switch controllers are needed for scaling at branch office sites with greater than 24 APs. Will share more details...Have fun with the list -r

Firewall—SIP/SCCP/RTP/RTSP Voice Support
Firewall—Alcatel NOE Support
Voice over Mesh
Video over Mesh
Named VLAN
VLAN Pooling
Captive portal
Rate Limiting for broadcast/multicast
Power save: Wireless battery boost
Power save: Drop wireless multicast traffic
Power save: Proxy ARP (global)
Power save: Proxy ARP (per-SSID)
Automatic Voice Flow Classification
Bridge Mode on Campus APs or Remote APs
SIP ALG
SIP: SIP authentication tracking
SIP: CAC enforcement enhancements
SIP: Phone number awareness
SIP: R-Value computation
SIP: Delay measurement
Management: Voice-specific views
Management: Voice client statistics
Management: Voice client troubleshooting
Voice protocol monitoring/reporting
SVP ALG
H.323 ALG
Vocera ALG
SCCP ALG
NOE ALG
Layer 3 Mobility
IGMP Proxy Mobility
Mobile IP
TKIP countermeasure mgmt
Bandwidth based CAC
Dynamic Multicast