Classic IP Phone DP21 Series

The DP21 is a classic IP phone that supports the registration of 2 SIP accounts. It features a 2.3-inch 132x64 resolution backlit black-and-white dot matrix LCD screen, advanced voice codec algorithms, and intelligent noise reduction technology. The DP21 Series provides users with high-definition voice quality and is suitable for ordinary staff, front desk, and secretary/assistant positions.

The Classic IP Phone DP21 Series

The DP21 Series is a classic IP phone launched by Star-net for government and enterprise customers, supporting the registration of 2 SIP accounts simultaneously. This product features a 2.3-inch 132x64 resolution backlit black-and-white dot matrix LCD screen, rich voice codec algorithms, intelligent noise reduction technology, support for OPUS voice codec, and intelligent soundproofing technology to provide users with high-definition voice quality. It also includes a 6-party local conferencing function and supports large-capacity local contact information storage, further enhancing users' office collaboration efficiency. Suitable for ordinary staff, front desk, secretary/assistant positions.

Key Features

Stylish Design

Featuring a stylish design with a 2.3-inch 132x64 resolution black-and-white dot matrix LCD screen, suitable for business office scenarios, incorporating ergonomic design details for a more comfortable operating experience.

High-Fidelity Sound Quality

Utilizing Ruijie's patented audio algorithms, supporting soundproofing technology, intelligent noise reduction technology, OPUS voice codec, and rich voice codec algorithms to provide users with a clearer voice communication experience.

Multi-Line Support

Supporting 2 lines, able to register 2 SIP accounts simultaneously to meet the needs of multiple line incoming, holding, and waiting scenarios in business office environments.

Extensive Contact Directory

Supporting storage of up to 1000 contacts, including local contact directories, remote contact directories, and blacklists.

Technical Specifications

Audio Features
High-fidelity sound quality	Full-duplex hands-free, HD handset with automatic echo cancellation. Supports AEC, ANS, AGC, CNG, VAD, AJB, and other audio processing
Wideband codecs	G.722, OPUS
Narrowband codecs	G.711a、G.711u、G.723、G.729AB、iLBC
DTMF	In-band, RFC2833, SIP INFO
Acoustic Echo Cancellation (AEC), background noise suppression (BNS), automatic gain control (AGC), comfort noise generation (CNG), voice activity detection (VAD), automatic jitter buffer (AJB), soundproofing.
Phone Features
Line quantity	2 lines (supports registering 2 SIP accounts simultaneously)
Number of keys	29 physical keys (including 4 programmable soft keys)
Call functions	Mute, do not disturb
	Call hold, call transfer, call waiting
	Call forwarding
	Redial, speed dial, hotline
	IP direct dial
	6-party voice conference
	Auto answer
Phone settings	Manual or automatic time setting
	Volume adjustment
	Language switching
	Screen saver
	Dialing rules
Address Book	Supports local address book: 1000 entries, supports import/export of address book
	local address book, LDAP address book, remote address book (enterprise address book)
	Blacklists
	Address book search, T9 search
	Call records: missed calls, received calls, dialed calls, transferred calls
IP-PBX Features
Call hold, call waiting, call forwarding
call forward (unconditional, no answer, busy, not registered)
call transfer (blind transfer, consultative transfer, semi-consultative transfer)
Caller ID display
Voicemail
Network Security Features
Network Features	Supports SIP V1 (RFC2543), V2 (RFC3261) protocol
	RTP/RTCP
	DNS SRV(RFC3263)
	STUN intranet penetration
	NAT/DHCP service
	Two IP acquisition methods: static IP/DHCP
	DTMF (in-band, RFC2833, SIP INFO)
	Bridge mode
	Built-in HTTP/HTTPS web server for configuration management
	Built-in SNTP time protocol
	Built-in DNS client
	Supports 802.1Q VLAN
Security Features	Supports HTTPS (SSL)
	Supports VLAN (802.1p/1q), optional support for VPN (L2TP)
	Supports IEEE802.1X
	Supports LLDP-MED
	Supports keyboard lock to protect personal privacy
	Supports administrator/user hierarchical mode
	Supports SRTP media encryption protocol
	Supports TLS signal encryption protocol
	Supports AES encryption protocol
Interfaces
Audio Output	1×RJ9 (4P4C) handset interface, 1×RJ9 (4P4C) headset interface
Network Interface	2×RJ45 10/100M Ethernet ports
Configuration Management
Configuration Methods	Supports HTTP/HTTPS protocol for web configuration management, Supports DHCP+HTTP/HTTPS automatic deployment, Supports four configuration modes: web page, phone keyboard, automatic configuration, EMU configuration distribution.
Management Methods	Supports TR069 for remote network management, Supports manual update via HTTP/HTTPS
Physical Characteristics
Body Color	Elegant gray
Dimensions	210×186×33mm (host), 210×186×72mm (with handset)
Package Dimensions	260×228×68mm (color box), 470×355×285mm (10 units transport box)
Operating Environment	Working voltage: DC 5V/1A, Working frequency: 48Hz-60Hz, Operating temperature: 0℃～40℃, Storage temperature: -20℃～+60℃.

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