C81

One‐button SIP Door Phone


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 key-less 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.

  • CDR

  • DDNS

  • SIP

  • TR069

  • Backup

  • Security

One‐button SIP Door Phone

HD Voice

Door Access: DTMF tones

Ideal for business, institutional and residential applications

Open remotely if there is an electronic door lock

One SIP line, Dual SIP servers

Door Phone features

Two‐way audio stream

High Stability and Reliability

SIP v1 (RFC2543), v2 (RFC3261)

SIP over TLS, SRTP

TCP/IPv4/UDP

HTTP/HTTPS/FTP/TFTP

ARP/RARP/ICMP/NTP

DNS SRV/ A Query/NATPR Query

STUN, Session timer

DHCP/Static/PPPoE

DTMF Mode: In‐Band, RFC2833 and SIP INFO

Easy Management 

  • Auto provisioning: FTP/TFTP/HTTP/HTTPS/PnP

    Configuration via HTTP/HTTPS web

    Configuration keypad‐based management

  • SNMP/TR069

    Configuration backup/restore

    Syslog

  • Features
  • Download
  • Aluminum surface, Metal bottom shell
    1 call button
    DTMF Mode: In‐Band, RFC2833 and SIP INFO
    DHCP/Static/PPPoE
    STUN, Session timer
    DNS SRV/ A Query/NATPR Query
    HTTP/HTTPS/FTP/TFTP
    TCP/IPv4/UDP
    SIP over TLS, SRTP
    Configuration backup/restore
    Syslog
    SNMP/TR069
    Configuration keypad‐based management
    HTTP/HTTPS Web Management
    Auto provisioning: FTP/TFTP/HTTP/HTTPS/PnP
    Comfort noise generator(CNG)
    Voice activity detection (VAD)
    Codec: PCMA, PCMU, G.729, G723_53, G723_63, G726_32
    Wideband codec: G.722
    Two‐way audio stream
    HD voice
    Action URL/Active URI remote control
    Default auto answer
    Door Phone features
    Door Access: DTMF tones
    One SIP line, Dual SIP servers
  • Comsns C81 One-Button SIP Door Phone Datasheet