IP Phones

C421

2.8" color screen (320x240); 12 SIP accounts, HD voice; supports 6-way audio conferencing;

Product details

C421 is a stylish, user-friendly IP phone. It features a 2.8" high-definition color screen (320x240), supports 12 SIP lines, and enables 6-way audio conferencing. With rich features such as HD audio, dual Gigabit ports, and built-in PoE, the C421 suits various enterprise application scenarios, offering users an excellent interactive experience and convenient instant communication services.

Certificate

CE&FCC

Keyboard: 39 keys, including: 7 DSS keys + 1 page key (with LED) 5 function keys (Contact, MWI, Mute, Headset, Redial) 4 Soft keys 4 navigation keys, 1 OK key 1 Back key, 1 Home key 12 standard numeric keys 2 volume control keys, Up/Down 1 hands-free key

Key features

General

2.8" color screen (320x240)

12 SIP lines

HD voice

Dual Gigabit ports, PoE enabled

21 smart DSS keys

Headset / hands-free / handset mode

Desk/wall stand (optional)

Optional external power supply

Headset with Hall-effect switch

Telephone features

Local address book (1000 entries)

Remote address book (XML/LDAP)

Call history (Incoming/Outgoing/Missed, 1000 entries)

Block list / Allow list

Screen saver (via server)

Voice message waiting indication (VMWI)

Programmable DSS/Soft keys

Network time synchronization

Poly wireless headset support (via Poly APD-80 EHS cable)

Jabra wireless headset support (via EHS20 EHS cable)

Recording support (via server)

Action URL / Active URI

XML browser

Customize wallpaper and boot logo

uaCSTA

Customize incoming call ringtone

Schedule (scheduled reboot/scheduled forwarding/scheduled update/scheduled configuration)

Hidden DTMF

Ringtone from headset

Customize DSS icon

Customize DSS LED

Customize BLF

Customize UI display

Call features

Outgoing call / Answer / Reject

Mute / Wake-up (Microphone)

Hold / Resume

Call waiting

Intercom

Caller ID display

Speed dial

Anonymous call (Hide caller ID/Reject anonymous calls)

Call forwarding (Always/Busy/No Answer)

Call transfer (Attended/Unattended)

Call parking / Retrieval (server-dependent)

Redial

Pre-dialing

Reminder

Do Not Disturb (DND)/Scheduled DND

Auto answer

SIP SMS

Voice message

6-way audio conference

Emergency line

Hot desking

Direct IP call without SIP proxy

Fuzzy call search

Action plan

Dial Plan

Call completion / Automatic redial

Primary and backup SIP servers

Default extension line

Multicast

SIP hotspot

Audio

HD voice: HD handset, HD speakerphone

HAC headset

16KHz wideband ADC/DAC sampling

Narrowband codec: G.711a/u, G.723.1, G.726,G.729,G.729A,G.729B,G.729AB, iLBC

Wideband codec: G.722, Opus

Full-duplex acoustic echo cancellation (AEC)

Voice activity detection (VAD) / Comfort noise generation (CNG) / Background noise estimation (BNE) / Noise reduction (NR) / Automatic gain control (AGC)

Packet loss concealment (PLC)

Dynamic adaptive jitter buffer

DTMF: In-band, Out-of-Band (RFC2833/ SIP INFO)

VQM voice quality monitoring

Network

Physical: Ethernet 10/100/1000 Mbps, dual port bridged for PC bypass

IP mode: IPv4/IPv6/IPv4&IPv6

IP configuration: Static IP / DHCP / PPPoE

Network access control: 802.1x

VPN: L2TP / OpenVPN

VLAN

LLDP

QoS

RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035)

DNS-SRV (RFC 3263)

Redundant server support

Agent

HTTPS mutual authentication

Protocols

SIP v1 (RFC2543) v2(RFC3261)

UDP/TCP/TLS

RTP/RTCP/SRTP (Optional/Mandatory)

STUN

DHCP

IPv6

LLDP

PPPoE

802.1x et 802.1p/Q

L2TP

OpenVPN

SNTP

FTP/TFTP

HTTP/HTTPS

TR-069

AES128 & AES256

Deployment & Maintenance

Automatic provisioning via FTP/TFTP/HTTP/HTTPS/DHCP OPT66/SIP PNP/TR-069

Screenshot

Web management portal

Web packet dump

Configuration export/import

Address book import/export

Firmware update

Syslog

Network firewall

Online update

Physical Specifications

LCD: 2.8" color screen (320x240)

HD headset (RJ9) x1

Standard RJ9 headset cable x1

CAT5.E 1,5M Ethernet cable x1

Desk stand x1

Status indicator x1 (Red)

RJ9 port x2: Headset x1, Headset x1

RJ45 port x2: Network x1, PC x1 (Bridged to Network)

Security slot x1

Power supply: 5V / 1A or PoE PoE compliant with IEEE 802.3a f Power adapter (optional): Input:100-240VAC~50/60Hz; Output:5V/1A

Power consumption (Adapter): 1.33~3.0 W

Power consumption (PoE): 1.9~4.6 W

Operating temperature: 0~45℃

Operating humidity: 10~95%

Installation: Desktop stand Wall (optional)

Color: Dark blue

Qty/CTN: 10 PCS

N.W/CTN:9.65 kg

G.W/CTN:10.50 kg

Device dimensions: Desktop stand (40°): 200.0 x 175.2 x 172.6 mm Desktop stand (45°): 200.0 x 185.3 x 160.6 mm Wall mounting: 200.0 x 217.7 x 70.4 mm

Gift box dimensions:303 x 223 x 56 mm

Outer CTN dimensions: 466 x 305 x 323 mm (10 PCS)

Specifications

See the manufacturer description and linked documentation for product information. No specification table is published on the captured product webpage.

Documents

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