Enterprise IP Phone KV-M4S20-PX

Overview

The KV-M4S20-PX IP phone from the Radonium series is the flagship enterprise model, engineered with an unmatched number of control keys for call centers and executive assistants. It is equipped with a 4.3-inch main display and two large 3.5-inch side displays, and supports 20 SIP accounts alongside 106 smart DSS keys. Video call reception, dual Gigabit Ethernet ports with PoE support, built-in Bluetooth and HD voice quality make it a full-fledged management console that is unrivaled on the market.

Technical specifications

Datasheet (PDF)

Model: KV-M4S20-PX

Generic

Specification: 20 SIP Lines 3 LCDs (Main + DSSJ) HD Voice Intelligent DSS Keys PoE Enabled Support receiving Video call
Phone Functions: Action URL/Active URI Blocked/Allowed List Call logs (In/Out/Missed, 1000 entries) Local Phonebook (2000 entries) Programmable DSS/Soft keys Support Wi-Fi Dongle
Call Functions: 3-way Conference Anonymous Call (Hide Caller ID) Auto-Answering Call Forward (Always/Busy/No Answer) Call Hold/Resume Call out/Answer/Reject Call Parking/Pick-up (Depending on server) Call Transfer (Attended/Unattended) Call Waiting Caller ID Display Do Not Disturb Hot desking Hot Line Intercom Mute/Unmute (Microphone) Redial Speed Dial Voice Message (With server)
Video: Video call resolution: QCIF/CIF/VGA Video codec: H.264

Deployment & Management

Deployment & Management: Auto-Provisioning via FTP/TFTP/HTTP/HTTPS/DHCP OPT66/SIP PNP/TR-069 Configuration Export / Import Firmware Upgrade Packet Dump Phonebook Import/Export Syslog Web Management Portal Web-based Packet Dump

Physical Specifications

Main LCD x1: 4.3-inch (480x272) Color Screen
DSS Key: 3.5-inch (320x480) Color Screen
Keypad: 4 x Soft Keys, 6 x Function Keys, 77 keys
HD Handset: 1.5M CAT5 Ethernet Cable x 1
Standard RJ9 Handset: 1 x Wire
Status Indicator Light: x1 (Red)
RJ9 Port x 2: Handset x1, Headset x1
RJ45 Port x2: Network x1 PC x1 (Bridged to Network)
USB2.0 Port x1: Connect with Wi-Fi/BT USB dongle or Flash Driver Standard A
Safety Keyhole: x1
DC Power Input: 5V/ 2A
Power Input: DC 5V/2A or PoE
Power Consumption (PoE): 2.6W~9W
Power Consumption (Adapter): 2.4W ~8W
Working Temperature: 0°~45°C
Working Humidity: 10%~95%
Weight: 1.5 Kg

Audio

Audio: DAC 16KHz Sampling HAC handset HD Voice Microphone Speaker (Handset/Hands-free, 0~7KHz Frequency Response) Wideband ADC
Narrowband Codec: AMR, G.711a/u, G.723.1, G.726-32K, G.729AB, ILBC
Wideband Codec: AMR-WB, Cous, G.722

Network

Physical: dual bridged port for PC bypass Physical: 10/100/1000 Mbps Ethernet
IP Configuration: 802.1x DHCP Network Access Control PPPoE Static IP
VPN: L2TP, OpenVPN
VLAN: VLAN / LLDP / Qo5/ RTCP-XR (RFC3611) VQ-RTCPXR, (RFC6035)
WIFI (Optional): WI-FI Security Mode: WPA/WPA2-PSK/802.1X EAP

Network & Management

IP Mode: IPv4/IPv6/IPv4&IPv6

Protocols

Protocols: 802.1x AES128 & AES256 DHCP FTP/TFTP HTTP/HTTPS IPv6 L2TP LLDP OpenVPN PPPoE RTP/RTCP/SRTP SIP2.0 over UDP/TCP/TLS SNTP STUN TR-069

General

Installation: Desktop Stand; Wall-mounted (need an additional wall hanging parts)
Dimensions: 226x308x86.5 mm

Downloads

Documentation

KV-M4S20-PX

DatasheetPDF481.4 KB

Download

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Frequently asked questions

Questions about this product

How can I make my IP phones more secure?

The key measures are using strong passwords, removing default accounts, keeping the firmware up to date, restricting access and segmenting the network logically.

Why does firmware matter for IP phones?

Firmware is the software built into the product, and it can affect performance, security and compatibility. Always upgrade it with the correct file and follow the official instructions.

What should I do before upgrading the firmware on an IP phone?

Check the exact model and the current firmware version, choose a compatible file and, if possible, back up the settings. A stable power supply and connection are essential during the upgrade.

Are IP phones compatible with products from other brands?

It depends on which standards and protocols are supported. Basic compatibility may be available, but proprietary features cannot always be guaranteed.

What role do ONVIF and similar standards play in IP phones?

Common standards like these are used to improve interoperability between equipment and software. However, you should also check the version and the exact features your project needs.

Frequently asked questions: IP Phones

Answers to common questions about this product line, from the KDT Help Center.

Why isn't my IP phone working properly?

First check the power, the cable or connection, the settings, the network address and the software status. Then you can move on to more in-depth checks and the logs.

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Where should I start when choosing the right IP phones?

Start by defining the intended use, the number of devices, the installation environment, the capacity required and your plans for future expansion. Then choose the model and technical specifications based on what the project actually needs.

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Which technical specifications matter most for IP phones?

Depending on the project, the most important specifications are capacity, speed, compatibility, environmental ratings, management features and scalability. Basing your choice on a single figure is usually not enough.

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Is a cheaper IP phone model always the right choice?

No. The purchase price is only one factor. You also need to consider reliability, features, service life, after-sales service and maintenance costs.

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How do I work out how much capacity an IP phone system needs?

Base the calculation on the number of devices, actual usage, how long the system will be in use and how much the project is likely to grow. It is also wise to keep some capacity in reserve.

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