The Cisco 9861 IP Desk Phone DP-9861-K9 is a high-quality, sleek black IP phone with 10 phone lines that offers a range of features for business communication. It is compatible with various VoIP protocols such as SIP, SDP, RTCP, RTP, and SRTP, and can be integrated with platforms like Cisco BroadWorks, Cisco Webex Calling, and Asterisk. With wireless capabilities including Wi-Fi and Bluetooth, this desktop phone supports conference calls and comes with a Trusted Platform Module (TPM) 2.0 for added security. Additionally, it has a power over Ethernet (PoE) support and provides a range of interfaces including USB and Ethernet for connectivity.