Cisco CP-524G Unified IP Phone More than 24 user-adjustable ring tones! Can receive power from IEEE 802.3af-compliant network modules Supported in Cisco Unified Communications Manager Express versions 4.2.6 and above using Smart Phone Control Protocol (SPCP) Hearing-aid-compatible (HAC) handset that meets ADA requirements; also meets ADA HAC requirements for a magnetic coupling to approved hearing aids. The phone dialing pad also complies with the ADA. Dynamically present calling options to the user; the scroll toggle bar allows easy movement through the displayed information