Panasonic KX-NT553-B IP Proprietary Telephone - 3-Line Backlit LCD, 24 Programmable Keys, Gigabit PoE, EHS
Panasonic KX-NT553-B IP Proprietary Telephone Black

Add the Panasonic KX-NT553-B to your Panasonic PBX system and gain a 3-line graphic backlit LCD, 24 self-labeling programmable CO keys, full-duplex speakerphone, and dual Gigabit Ethernet ports with PoE Class 3 power — all in a sleek black desktop form factor. This is an IP Proprietary Telephone (IP-PT) that operates exclusively with a compatible Panasonic PBX system and is not designed for use with SIP-based platforms.

Panasonic KX-NT553-B -- Key Features & Benefits

  • 3-Line Backlit LCD Display: 242 x 55 pixel graphic LCD with 24 characters per line and 4 contrast levels for clear visibility in any office lighting
  • 24 Self-Labeling Programmable Keys: 12 flexible CO buttons per page across 2 pages (24 total), each automatically labeled on the adjacent Sub LCD — no physical label strips needed
  • Full-Duplex Speakerphone: Built-in full-duplex speakerphone with adjustable volume for clear, natural hands-free conversations
  • Wideband-Compliant Handset: Supports G.722, G.711, and G.729A audio codecs when used with a compatible Panasonic PBX for high-quality voice on every call
  • Hearing Aid Compatible (HAC): Handset meets TIA-1083 standard with T-Coil support as confirmed in the official Panasonic Quick Reference Guide
  • Two Gigabit Ethernet Ports: One LAN port for your network switch; one pass-through port for a desktop PC — both from a single wall connection
  • PoE Class 3 Powered: When connected to a PoE-capable switch, no AC adapter is required at the desk; optional KX-A239 adapter available for non-PoE environments
  • EHS Headset Port: 3.5mm Electronic Hook Switch port supports selected Plantronics (Poly) wireless headsets for remote answer and end-call control without a separate adapter
  • DSS Console Expansion: Supports up to 4 KX-NT505 48-key add-on modules for large-scale key assignments (maximum 1 module when wall-mounted)
  • Enterprise Network Support: VLAN tagging, QoS (DiffServ), and DHCP Client for managed enterprise network environments

Panasonic KX-NT553-B -- Technical Specifications

  • Manufacturer: Panasonic
  • Part Number: KX-NT553-B
  • Color: Black
  • Product Type: IP Proprietary Telephone (IP-PT)
  • Display: 3-line graphic backlit LCD, 242 x 55 pixels, 24 characters per line, 4 contrast levels
  • Programmable Keys: 24 total (12 self-labeling flexible CO buttons per page, 2 pages)
  • Soft Keys: 4 (S1–S4)
  • Audio Codecs: G.722, G.711, G.729A
  • Speakerphone: Full-duplex with adjustable volume
  • Ring Tones: 30 selectable
  • Ethernet Ports: 2 x Gigabit (10/100/1000Mbps) — LAN port + PC pass-through port
  • Power: PoE Class 3; optional KX-A239 AC adapter for non-PoE environments (sold separately)
  • Wired Headset Jack: 2.5mm
  • EHS Port: 3.5mm — selected Plantronics (Poly) wireless headsets; see panasonic.net/pcc/support/pbx for current compatibility list
  • Hearing Aid Compatible: Yes — TIA-1083 standard, T-Coil compatible
  • Network: VLAN, QoS (DiffServ), DHCP Client
  • Wall Mountable: Yes — optional KX-A433 wall-mount kit required (sold separately)
  • DSS Expansion: Up to 4 x KX-NT505 48-key modules (maximum 1 when wall-mounted)
  • Dimensions (W x D x H): High position: 10.51 x 7.36 x 7.09 in / Low position: 10.51 x 6.69 x 6.10 in (incl. handset & stand)
  • Weight: 1,180g / 41.6 oz (incl. handset, cord & stand)
  • In the Box: Phone base with stand, handset, handset cord
  • Compatible PBX Systems: KX-NS1000 (PCMPR v3.0000+), KX-NCP500/NCP1000 (PBMPR v8.0000+), KX-TDE100/TDE200 (PMMPR v8.0000+), KX-TDE600 (PGMPR v8.0000+)

Panasonic KX-NT553-B -- Frequently Asked Questions (FAQ)

  • What PBX systems is this phone compatible with?
    The KX-NT553-B works with the KX-NS1000 (PCMPR v3.0000+), KX-NCP500/NCP1000 (PBMPR v8.0000+), KX-TDE100/TDE200 (PMMPR v8.0000+), and KX-TDE600 (PGMPR v8.0000+), per the official Panasonic Quick Reference Guide.
  • Will this phone work with SIP-based systems?
    No. This is an IP Proprietary Telephone (IP-PT) that uses Panasonic's proprietary signaling — it is not designed for SIP-based platforms. A compatible Panasonic PBX is required for operation.
  • Is a power adapter or Ethernet cable included?
    No. The box includes the phone base with stand, handset, and handset cord only. When connected to a PoE switch, no AC adapter is needed. The optional KX-A239 AC adapter is available separately for non-PoE environments.
  • Which wireless headsets work with the EHS port?
    The 3.5mm EHS port supports selected Plantronics (Poly) wireless headsets. For the current compatibility list, refer to panasonic.net/pcc/support/pbx as cited in the official Panasonic Quick Reference Guide. Wired headsets KX-TCA400 and KX-TCA430 are confirmed compatible via the 2.5mm jack.
  • Can I expand the number of programmable keys?
    Yes. Up to 4 KX-NT505 48-key DSS modules can be connected when desk-mounted (maximum 1 when wall-mounted with the KX-A433 bracket). Each module adds 48 flexible CO buttons with dual LED indicators and is sold separately.
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