Headset adapter cable for Cisco Cordless IP phone model 7920. Plantronics cable has a special 2.5mm plug adapter with 4-conductors (3 black bands). The other end of the cord has quick disconnect to snap together with either the H91-CIS or H101-CIS headset. These two models are specially engineered with increased RF shielding to mitigate any buzzing sounds due to the strong signal of the cordless phone.
The Cisco Wireless IP Phone 7920 is an easy-to-use IEEE 802.11b wireless IP phone that provides comprehensive voice communications in conjunction with Cisco CallManager and Cisco Aironet 1200, 1100, 350, and 340 series of Wi-Fi (IEEE 802.11b) access points. As a key component of the Cisco AVVID Wireless Solution, the Cisco Wireless Solution, the Cisco Wireless IP Phone 7920 delivers seamless intelligent services such as security, mobility, quality of service (QoS), and management, across an end-to-end Cisco network.