● 3 PBX accounts.
● Support up to 20 groups paging functions.
● LEDs and function keys embedded design, LEDs reflects the device work status, function keys can be used to adjust the volume, broadcast IP and one key to reset to Factory Defaults.
● Built-in microphone and external 3.5mm microphone interface can be switched freely.
● Support remote web management and maintenance, such as account maintenance, software upgrades, volume control and so on.
● POE power supply (802.3af/at).
NOTE: If speaker voice is up to 5 level. For avoid power shortages and lead it restart, you need to use power adapter or support 802.3at's POE power adapter.
Support 3 accounts line;
Active / passive support;
Support calls holding, calls waiting and calls transfer;
Call transfer (busy turn, blind turn, consulting turn)，mute, don't disturb，Auto answer，three-way conference, the volume control and so on；
support IP direct dial without account，Support up to 20 groups Paging functions simultaneously (the priority decreases from 1 to 20)
Support SIP V1（RFC2543）,V2（RFC3261）；
Support DNS SRV（RFC3263）；
Support STUN network penetration；
Support 3 DTMF model: In-band,、RFC2833、SIP INFO；
Support Network model： StaticIP/DHCP/PPPoE；built-in DNS/TFTP/FTP terminal；
Support NAT/DHCP service ；
Support SIP and RTP Qos
Support TLS（Transport Layer Security）protocol；
Support information authentication mechanism MD5；
Support AES encryption protocol；
Support phone locks, support the Root/User level management mode
Wideband encoding: G.722；
Narrow band encoding:G.711μ/A, G723.1, G726, G.729AB，iLBC；
Support VAD, CNG, AEC, AGC etc. audio processing；
Full duplex speaker, with automatic echo elimination (AEC).
One RJ-45 10/100M Ethernet interfaces(LAN)，LAN port is for the use of ordinary model ；
One power adapter;
Power ：DC 12V/1A；
ABC keys function definitions:
A key: volume increase;
B key: quickly reset to Factory Defaults by pressing the button 20 seconds (refer to soft recovery, not hard recovery), press 1 time means broadcasting the current IP address;
C key: volume decrease.
ABC-LEDs keys function definitions:
A (network) Green slow flash - network connection is fail; The light off - the network connection is normal; B (Paging) The light off - Paging is idle; red flash - Paging is busy;
C (SIP Account ) The light off - the registration is successful / idle; blue flash - Account busy; blue flashing slowly - registration is fail;
Quick flash is 1s / times, slow flash is 2s / times