Telephony interfaces 
Two (2) FXS ports
Network interfaces 
One (1) 10/100Mbps Ethernet port with auto-detection (RJ45)
LED indicators 
POWER (power supply), INTERNET (Internet connection), PHONE1 (phone1), PHONE2 (phone2)
Factory Reset button
Yes
Telephony functions
Number detection and blocking number detection, waiting for a call, transferring a call using the Flash button, blind call transfer, accompanied call transfer, forwarding, hold, blocking incoming calls, 3-way conferencing
G.711 voice codecs with Supplement I (PLC) and Supplement II (VAD/CNG), G.722, G.723.1, G.729A/B, G.726, iLBC, OPUS, dynamic delay oscillation buffer, advanced line echo cancellation
Fax by IP 
Fax relay of the third group of the standard T.38 with support
for data transfer rates up to 14.4 kbit/s and auto-switching in G 711 for fax transmission
Call range for short-range/long-range communication 
2 REN: up to 1km by 24 AWG
Caller ID 
(Caller ID) Bellcore types 1 and 2, ETSI, BT, NTT, and DTMF-based CID
Separation methods 
Busy signal, Reverse polarity/control pulse, Current in the circuit
Network protocols 
TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, SSH,
STUN, SIP (RFC3261), SIP over TCP/TLS, SRTP*, TR-069
QoS 
Layer 2 (802.1Q VLAN, SIP/RTP 802.1p), Layer 3 (ToS, DiffServ, MPLS)
DTMF method 
In-audio, RFC2833 and/or SIP INFO
Setup and management 
HTTP, HTTPS, SSH, TFTP, TR-069, secure and automated configuration
using AES encryption, system log
Wednesday 
SRTP*
Control 
TLS/SIPS/HTTPS
Management 
System log support, SSH, remote management via browser
Universal power supply
Input: 100-240V AC, 50-60Hz
Output: 5.0V post.current/1.0A
Environment
Working: 32º – 104ºF or 0º – 40ºC
Keeping: 14º – 140ºF or -10º – 60ºC
Humidity: 10 – 90% non-condensing
Dimensions and weight 100mm x 100mm x 29.5mm, 114g (without packaging)