https://www.cisco.com/c/en/us/products/collaboration-endpoints/unified-ip-phone-6900-series/eos-eol-notice-listing.html
Cisco Unified IP Phone 6900 Series - End-of-Life and End-of-Sale Notices - Cisco
End-of-Life and End-of-Sale Notices
ip phone 6900 seriesend of life
https://www.cisco.com/c/en/us/support/collaboration-endpoints/unified-ip-phone-6900-series/products-user-guide-list.html
Cisco Unified IP Phone 6900 Series - End-User Guides - Cisco
ip phone 6900 seriesend userciscounifiedguides