   |
| Specifications | KX-NT556 | KX-NT553 | KX-NT551 |
| Display | |||
| LCD Display | Graphic | Graphic | Graphic |
| LCD Size (dots WxH) | 242x109 | 242x55 | 160x18 |
| LCD Contrast | 4 levels | 4 levels | 4 levels |
| LCD Backlight | On/ Auto/ Off | On/ Auto/ Off | On/ Auto/ Off |
| Install Options | |||
| Desk mount tilt | Yes (2 positions) | Yes (2 positions) | Yes (1 position) |
| Wall mount | KX-A433 (Optional) | KX-A433 (Optional) | (Optional) |
| Power | KX-A239 (Optional) | KX-A239 (Optional) | KX-A239 (Optional) |
| Dimensions | High: 267x170x180mm Low: 267x187x155mm |
High: 267x170x180mm Low: 267x187x155mm |
205x160x170mm |
| Audio Features | |||
| Handset / Headset volume |
6 levels | 6 levels | 6 levels |
| Handset | Wideband compliant, Hearing Aid compatibility (HAC) |
Wideband compliant, Hearing Aid compatibility (HAC) |
Wideband compliant, Hearing Aid compatibility (HAC) |
| Speaker Phone | Yes (Full Duplex) | Yes (Full Duplex) | Yes (Full Duplex) |
| Speaker phone volume |
8 levels | 8 levels | 8 levels |
| Bluetooth (for headset) | No | No | No |
| Ringtones | 30 | 30 | 30 |
| Ringer Volume | 4 levels + Off | 4 levels + Off | 4 levels + Off |
| Headset port | 2.5mm audio jack | 2.5mm audio jack | 2.5mm audio jack |
| Electronic Hook Switch Control Port (EHS) |
3.5mm Plantronics compatible |
3.5mm Plantronics compatible |
No |
| Audio Codec | G.711, G.722, G.726, G.729a |
G.711, G.722, G.726, G.729a |
G.711, G.722, G.726, G.729a |
| Keys | |||
| Soft Keys | 4 | 4 | No |
| Programmable Keys | 36 (12 keys x 3 pages) | 24 (12 keys x 2 pages) | 8 |
| 0, 9,*,# Keys | Yes | Yes | Yes |
| Navigator & Cancel Key | Yes | Yes | Yes |
| Features | |||
| Desiless (Soft Labelling Keys) |
Yes | Yes | Yes |
| Auto Redial | Yes | Yes | Yes |
| Off Hook Monitor | Yes | Yes | Yes |
| Handset / Headset Mic Mute |
Yes | Yes | Yes |
| Outgoing - Incoming Call Log |
Yes | Yes | Yes |
| Melody Ringer | Yes (10 title) | Yes (10 title) | No |
| EcoMode | Yes*³ | Yes*³ | Yes*³ |
| Networking | |||
|
Ethernet Ports |
2x 10/100/1000 (Gb) | 2x 10/100 | 2x 10/100 |
| Power over Ethernet (PoE) | Yes | Yes | Yes |
| Bluetooth | Yes (Built in) | No | No |
| Firmware upload | Yes | Yes | Yes |
| Peer to Peer connection | Yes | Yes | Yes |
| VLAN | Yes | Yes | Yes |
| QoS (Diffserv) | Yes*¹ | Yes*¹ | Yes*¹ |
| DHCP Client | Yes | Yes | Yes |
| VoIP Security | Yes | Yes | Yes |
| Ping Transmission | Yes | Yes | Yes |
| IP Port Flexibility | Yes | Yes | Yes |
| Rerouting to secondary PBX |
Yes | Yes | Yes |
| NAT Traversal | No | No | No |
| Media Relay Gateway | Yes | Yes | Yes |
| DSS Console | KX-NT505 | ||
| LCD | No | ||
| Keys | 48 | ||
| Connection | Serial I/F to NT550 series | ||
| AC Adaptor | Yes*² | ||
| Installation | Desktop (1 position) Wall mount | ||
| Dimension (WxDxH) mm | High: 137x161x135mm, Low: 137x183x114mm | ||
Note:
*¹) Only support this feature for packets (PTAP/ MGCP/ RTP) From NT500. The packets of PC Port is sent
or received without conversion.
*²) AC Adaptor is not necessary for only one module use, but is necessary for 2nd to 4th module.
*³) ECO Mode: Setting way method is local programming. Following limitation under ECO Mode:
LAN Speed is 10Mbps only, cannot use 2nd port.