Cp-7821-K9 Cisco 2 Lines IP 2 Ethernet Port PoE Phone has two lines hence the user may have two service provider at any one given time, Cisco CP-7821 phone comes with dedicated keys that include speaker, directory and messaging, this reduces the time in dialing or sending messages,
Cisco CP-7811-K9 IP VoIP phone delivers advanced IP Telephony features and crystal clear wideband audio performance , CP-7811-K9 IP VoIP phone deliver an easy-to-use, full-featured voice communications experience on Cisco on-premises and hosted infrastructure platforms and third party hosted call control. It supports one line (available in charcoal only).