The SIP based audio system DP21 utilizes the built-in intercom and paging capability already inherent in most modern IP PBX systems.

 DP21 SIP intercom can be easily configured in varies application scenarios like bank, schools, mining, cities, etc.

Feature Highlights


• Support SIP2.0 (RFC3261) and correlative RFCs
• SIP support 2 SIP servers, and backup SIP proxy servers
• Supports SIP UDP / TCP/ TLS
• SIP support SIP domain, SIP authentication (none, basic, MD5) , DNS name of server, Peer to Peer / IP Call
• WAN / LAN:10/100M Ethernet ports
• 802.3af POE(optional)
• VLAN(Voice VLAN/Data VLAN)
• 802.1X
• NAT transverse :Support STUN client
• DHCP client on WAN/ DHCP server on LAN
• Main DNS and secondary DNS server
• DNS Relay
• SNTP Client
• Firewall and DMZ
• Web management access restricted
• VPN(L2TP/Open VPN)
• WEB ,telnet and LCD menu management
• Management with different account right
• Recover firmware and factory reset through POST mode
• Upgrade firmware via HTTP, HTTPS, FTP, TFTP
• DHCP option66 and custom option for auto provisioning
• Auto Provisioning to upgrade configuration file
with AES(256) encryption
• TR-069 and Syslog


• 3 way call conference
• Capable of 10 way conversation
Call pickup/ park/ back
• Redial
• Call completion
• Hot desking
• SIP messaging , MWI
• Flexible dial plan
• Barring function for outgoing calls
• Do not disturb
• Auto answer
• Caller ID display
• CLIR(rejects anonymous calls)
• CLIP(to make an anonymous call)
• Dial without registration
• Call logs with missed calls/ incoming calls/
outgoing calls. Each support 300 records
• Phonebook 500 records
• Speed Dial (abbreviated dialing)
• Call rejection
• Black List/ White List
• Intercom/Intercom barge
• Password dial, DTMF hidden
• Action URL/ active URI
• Voice codec setting for each SIP line
• Multicast
• LDAP, XML phonebook
• Web dial
• Keypad lock, Emergency call
• Large dot matrix LCD display and soft keys make user
easier to use
• Soft keys programmable
• Function keys programmable (each key have 2-color
led indication)
• Supports RJ-9 headset
• Multi languages displayed
•Codec: G.711A/u, G.7231 high/low, G.729AB, G.722, G.726-32
• DTMF: In-band, RFC 2833 and SIP INFO
• Full duplex hands- free speaker phone with acoustic echo cancellation
• Voice Activity Detection (VAD)
• Comfort Noise Generation (CNG)
• Background noise suppression
• Adaptive jitter buffers
• Packet loss concealment
• mute
Physical features
• Adapter Input: AC 100-240V
• Adapter Output: DC 5V/1A
• WAN Port -10/100 BASE-T RJ-45 for LAN
• LAN Port-10/100 BASE-T RJ-45 for PC


• Keypad:1or2 DSS Keys (Speed Dial)
• RJ45 Ethernet Jacket x2: Network x1 (802.3AF POE Enabled), PC x1 (Bridged to Network)
• Main Chipset: Broadcom
• Passive Switch(short-circuit output): Normally Open and   Normally Closed highest at 30V/1A AC/DC
• Output interface for active speaker
• Audio record output interface
• 2 embedded short circuit input interfaces
• 2 embedded short circuit output interfaces
• Speaker: 3W/4Ω • Cables: CAT5 or better
• Power Supply: 9V~16V/1A DC or PoE
• Standby power consumption: 1.54W
• The call intercom of power consumption: 1.81W
• Shell Material: Front plate, aluminum alloy. Back plate, Cast aluminum
• Protection level: IP65 and IK10
• Working Temperature: -40~70℃
• Storage Temperature: -40~70℃
• Working Humidity: 10~90%