Refurbished to Like-New with Warranty Cisco CP-8851-K9 / CP-8851-K9= IP Phone for Cisco Call Manager platforms. These are for enterprise CUCM deployments and will not work on 3rd party SIP like Ringcentral, you need the 3PCC for that found here ->

Cisco 3rd Party Call Control / MPP Phones

The Cisco 8851 Gigabit IP Phone for CUCM/Enterprise is a refurbished device that offers seamless communication for your business needs. With its sleek and modern design, this IP phone is not only a functional tool but also adds a touch of sophistication to any workspace.

Specifications:

• Color: Charcoal
• Standard Handset with Warranty
• Protocol Support: SIP
• Power Port for PWR-CUBE-4

Condition: Refurbished
Warranty: 10 Years
UPC: 882658698422
PN: CP-8851-K9