Here is a link to the full 6800 series phone guide [Cisco 6800 User Guide][1] [1]: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/MPP/6800/english/userguide/p680_b_6800-user-guide-mpp.html
**Click the phone picture for the Quick Start Guide.** The default voicemail pin is 159357. Cisco 6851 - Gray Screen 4-line Device _[Cisco 6851 ][1]- Quick Start Guide_ [![][2]][3] Cisco 6871 - Colored Screen 6-line Device _[Cisco 6871 ][4]- Quck Start Guide _ [![][5]][6] **All phones include the following (nu…