Panasonic - KX-NT553-B IP Proprietary Telephone - 3-Line Backlit LCD, 12x2 Self-Labeling CO Keys, 2-Port Gigabit Ethernet, PoE, EHS - Black

The Panasonic KX-NT553-B is an IP Proprietary Telephone designed for use with compatible Panasonic PBX systems, including the KX-NS1000, KX-NCP500, KX-NCP1000, KX-TDE100, KX-TDE200, and KX-TDE600. It is not a standalone phone and requires an operational Panasonic PBX to function. The phone features a 3-line graphic backlit LCD display (242 x 55 pixels, 24 characters per line, 4 contrast levels) with 12 self-labeling flexible CO buttons organized across 2 pages, providing 24 total programmable keys. Four soft keys and a full navigator key set allow quick access to call features and system menus. The wideband-compliant handset is Hearing Aid Compatible (HAC, TIA-1083) and supports G.722, G.711, and G.729A audio codecs. A built-in full-duplex speakerphone with 8 volume levels enables clear hands-free communication. Two Gigabit Ethernet ports (10/100/1000Mbps) connect the phone to the network and pass traffic through to a desktop PC from a single wall port. The phone is powered via PoE Class 3, so no AC adapter is required. The 3.5mm EHS port supports selected Plantronics-brand wireless headsets for remote call control, and a 2.5mm jack accommodates standard wired headsets. Up to 4 KX-NT505 48-key DSS add-on modules can be connected (1 maximum when wall-mounted). Wall-mount kit KX-A433 and AC adapter KX-A239 are available as optional accessories.

• Requires Panasonic PBX — Not a Standalone or SIP Phone: The KX-NT553-B is an IP Proprietary Telephone (IP-PT) that operates exclusively with compatible Panasonic PBX systems. Per official documentation: KX-NS1000 (firmware v3.0+), KX-NCP500/KX-NCP1000 (v8.0+), KX-TDE100/KX-TDE200 (v8.0+), KX-TDE600 (v8.0+). It cannot function as a standalone device or with third-party SIP systems. A compatible, operational Panasonic PBX is required prior to use.
• 3-Line Backlit LCD with 12x2 Self-Labeling Programmable Keys: The graphic backlit LCD (242 x 55 pixels, 3 lines x 24 characters, 4 contrast levels) displays caller ID, call logs, and system status. Twelve self-labeling flexible CO buttons per page across 2 pages deliver 24 total programmable keys, each labeled via the adjacent Sub LCD. Four soft keys (S1–S4) and navigator keys provide intuitive call handling and menu navigation.
• Full Duplex Speakerphone with Wideband HAC Handset: The built-in full-duplex speakerphone with 8 volume levels supports clear hands-free communication. The wideband-compliant handset carries audio via G.722, G.711, and G.729A codecs. The handset meets Hearing Aid Compatibility requirements per TIA-1083 standard, confirmed in the official Panasonic Quick Reference Guide. Handset and headset volume are independently adjustable across 6 levels.
• 2-Port Gigabit Ethernet with PoE Class 3 Power: Two integrated 10/100/1000Mbps Gigabit Ethernet ports connect the phone to your network switch and pass through to a desktop PC from a single wall port. Powered by PoE Class 3 — no separate power adapter required. Note: PC pass-through port does not supply PoE to connected devices. Optional KX-A239 AC adapter available for non-PoE switch environments (sold separately).
• EHS Wireless Headset Port + Up to 4 KX-NT505 DSS Modules: The 3.5mm Electronic Hook Switch (EHS) port supports selected Plantronics-brand wireless headsets for remote answer/end-call control. The 2.5mm headset jack supports standard wired headsets (Panasonic KX-TCA400 or KX-TCA430 tested). Up to 4 KX-NT505 48-key DSS add-on modules can be connected (1 maximum when wall-mounted with KX-A433). Each KX-NT505 adds 48 flexible CO buttons. Sold separately.