Cisco Systems, Inc. CP-3905= VoIP phone

Unified SIP Phone 3905 overview

The Cisco CP-3905= is a VoIP phone designed for SIP-based telephony systems. It provides a single line and a monochrome graphical display with a resolution of 128 x 32 pixels. The handset includes a built-in speakerphone for hands-free conversations. It is intended for desktop or wall-mounted use in office environments.

Deployment fit and limitations

This phone suits organisations that need a basic, single-line SIP endpoint with Power over Ethernet support. It works well for common areas, lobbies, or standard desk positions where a simple interface is preferred. Buyers who require multiple line appearances, colour displays, or advanced programmable keys should consider other models.

Deciding specification — dual RJ-45 ports with PoE

The unit has two network (RJ-45) ports and supports PoE, allowing it to pass network connectivity to a PC while drawing power from the switch. This single detail determines whether the phone matches your cabling and power infrastructure.