SIP Door Phone – Dinstar India
                     One-button
SIP Door Phone
C81
HD Audio
Unlock door with 
DTMF
H Po
D E
Overvi
ew The C81 is an One‐button SIP Door Phone with advanced audio 
system with the  echo cancellation function. with the C72 touch 
screen control pad, you can  speak to visitors at any time.
The C81 offers keyless control and convenience for the users 
opening the door  without a key. The door can be open remotely 
if there is an electronic door lock.  It’s ideal for control 
communication and security over internet such as business,  
institutional and residential applications .
Gateway to VoIP www.dinstar.c
World om
Honesty 
Focus  Innovative 
Open-minded
Access Audio 
Control Features
• One SIP line, Dual SIP servers • HD voice
• Door Access: DTMF tones • Two‐way audio stream
• Door Phone features: • Wideband codec: G.722
• Full‐duplex • Narrowband codec: PCMA, 
• Default auto answer PCMU,  G.729, G723_53, 
• Action URL/Active URI remote G723_63, G726_32
control • Echo cancellation with G.168
• Speed Dial • Voice activity detection (VAD)
• Comfort noise 
Administration generator(CNG)
Features
• Auto provisioning:  • Built‐in Micro and speaker
FTP/TFTP/HTTP/HTTP P•roAtcoocuoslsti c&  echo cancellation 
S/PnP Neatwudoirok output• SIP v1 (RFC2543), v2 
• HTTP/HTTPS Web (RFC3261)
Management • SIP over TLS, SRTP
• Configuration keypad‐ • RTSP
based  management • TCP/IPv4/UDP
• SNMP/TR069 • RTP/RTCP, RFC2198, 1889
• NTP/Daylight Saving • HTTP/HTTPS/FTP/TFTP
Time • ARP/RARP/ICMP/NTP
• Firmware Upgrade via • DNS SRV/ A Query/NATPR 
EnWvierobnmen Query
•tsSyslog • Primary /Secondary DNS
• COopnefiragtuinragt iToenm perature:‐ • STUN, Session timer
b2a0c~k6u0p /℃restore • 802.1p/q, DSCP
• Storage Temperature: ‐ • DHCP/Static/PPPoE
40~70 ℃
• Relative Humidity: •PhysDicTaMl FS pMeocdifiec:a Itnio‐Bnasnd, 
10~90% RFC2833 and  SIP INFO
• 1 call button
• Aluminum surface, Metal bottom 
shell
• Power Supply: DC 12V1A or 
802.3af PoE
• Power Requirements: 802.3af 
PoE class 3
• IEEE 802.3af Power‐over‐
Ethernet
• 1xRJ45 10/100M Ethernet jacks
• Wall‐mounted installation
• Dimensions: 200*130*32 mm
Technical Support
Visit Dinstar web site (http://www.dinstar.com/) for more product 
documents, FAQ, and more.  For better service, please contact with 
[email protected] or online support.
GaCtheewnagyd uto C VoomIPm sns Technologies Co., Ltd. Email: 
World
[email protected] www.dinstar.com