-Các Codec: G.711 A-law/U-law; G.722; G.723.1 5.3K/6.3K; G.726; G.729A/B; Opus, iLBC; GSM-FR; AAL2-G.726-32; Adds echo cancellation, jitter buffer and silence suppression.

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Interfaces
E1 Interface	4 RJ45 ports, supporting up to 120 simultaneous VoIP calls
Network Interfaces	Dual self-adaptive Gigabit ports (switched or routed)
Peripheral Ports	2 USB 3.0, SD card interface
LED Indicators	LAN, WAN, E1
LCD Display	128 x 32 dot matrix graphic LCD with DOWN and OK buttons
Reset Switch	Yes, long press for factory reset and short press for reboot
Voice & Video Capabilities
Voice-over-Packet Capabilities	LEC with NLP Packetized Voice Protocol Unit, 128ms-tail-length carrier grade Line Echo Cancellation,
Voice-over-Packet Capabilities	Dynamic Jitter Buffer, Modem detection & auto-switch to G.711
Voice and Fax Codecs	G.711 A-law/U-law, G.722, G.723.1 5.3K/6.3K, G.726, G.729A/B, iLBC, AAL2-G.726-32
Fax over IP	T.38 compliant Group 3 Fax Relay up to 14.4 kpbs and auto-switch to G.711 for Fax Passthrough, Fax data pump V.17, V.21, V.27ter, V.29 for T.38 fax relay
Voice-quality Enhancement	Echo cancellation (G.168-2004), Jitter buffer, Silence suppression (VAD, CNG), PLC
QoS	Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS
Signaling & Control
DTMF Methods	In-band audio, RFC2833, and SIP INFO
Digital Signaling	SIP (RFC 3261) over UDP/TCP/TLS, PRI, SS7, MFC R2, RBS (pending)
	PRI switch types: Euro ISDN, nation, Q.SIG
	CAS: MFC R2 (Argentina, Brazil, China, Czech Republic, Colombia, Ecuador, Indonesia, ITU, Mexico,
	Philippines, Venezuela)
	SS7: ITU, ANSI, China
Upgrade	Firmware upgrade via TFTP / HTTP / HTTPS or local HTTP upload
Device Management	Syslog, HTTPS, Web browser, voice prompt, TR-069 management, backup and restore, port capture and packet capture
Network Protocols	TCP/UDP/IP, RTP/RTCP, ICMP, ARP, DNS, DDNS, DHCP, NTP, TFTP, SSH, HTTP/HTTPS, PPPoE, STUN, SRTP, TLS, LDAP, PPP, Frame Relay (pending), IPv6, OpenVPN®
Status and statistic	Call status and history, device status monitoring and ISDN status monitoring
Security
Media Encryption	SRTP, TLS, HTTPS, SSH, 802.1X
User-defined ports	SIP port, RTP port, HTTP/HTTPS port
Advanced Defense	Fail2ban, alert events, Whitelist, Blacklist, strong password based access control
Physical
Mounting	Rack mount & Desktop
Multi-Language Support	Web UI: English, Simplified Chinese, Traditional Chinese, Spanish, French, Portuguese, German, Russian, Italian, Polish, Czech; Customizable IVR/voice prompts: English, Chinese, British English, German, Spanish, Greek, French, Italian, Dutch, Polish, Portuguese, Russian, Swedish, Turkish, Hebrew, Arabic; Customizable language pack to support any other languages
Compliance	FCC: Part 15 (CFR 47) Class B, Part 68
	CE: EN55022 Class B, EN55024, EN61000-3-2, EN61000-3-3, EN60950-1, TBR21, RoHS
	RCM: AS/NZS CISPR 22, AS/NZS CISPR 24, AS/NZS 60950, AS/ACIF S002
	ITU-T K.21 (Basic Level); UL 60950 (power adapter)
	T1: TIA-968-B Section 5.2.4
	E1: TBR4/TBR12/TBR13, E1: AS/ACIF
Temperature and Humidity	Operating: 32 - 113ºF / 0 ~ 45ºC, Humidity 10 - 90% (non-condensing)
Temperature and Humidity	Storage: 14 - 140ºF / -10 ~ 60ºC, Humidity 10 - 90% (non-condensing)
Universal Power Supply	Input: 100 ~ 240VAC, 50/60Hz; Output: DC+12V, 1.5A
Dimensions	485 x 190 x 46mm
Weight	2.380g