Cisco CP-PWR-CUBE-3 delivers AC power to the Cisco 7900 series VoIP phones. Cisco generally does not bundle power supplies with phones because oftentimes the phones are powered via PoE and the cords are thrown away. However, users who do not have access to PoE do require an AC power cord.

The PWR-CUBE-3 is a universal power supply compatible with nearly every phone from Cisco, except for wireless versions and some older conference phone models.