Changes

*[https://docs.poly.com/bundle/vvx-ip-ug-current/page/vvx-250-hardware.html Overview of Button Layout]

*[https://www.poly.com/content/dam/www/products/support/voice/vvx-business-ip-phones/user/vvx-250-350-450-quick-tips-en.pdf Quick Start Guide]

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[[File:Ccx400b.jpg|frameless|left|100px]] PolyCom CCX 400 (Multi Line Phone)

*[https://docs.poly.com/bundle/ccx-teams-ug-current/page/poly-ccx-400-business-media-phones-hardware.html Overview of Button Layout]