• Users: 300 (up to 500)
• Max Concurrent Calls: 60 (up to 120)
• Max Analog Ports: 24
• Max BRI Ports: 24
• Max Cellular Ports: 6
• Max E1/T1/J1 Ports: 3
• VoIP Trunks: 100
• Protocol: SIP (RFC3261), IAX2
• Transport Protocol: UDP, TCP, TLS, SRTP
• Codec: G.711 (alaw/ulaw), G.722, G.726, G.729A, GSM, Speex,

ADPCM, iLBC, H.263, H.263P, H.264, MPEG4
• DTMF: In-band, RFC4733, RFC2833, SIP INFO
• LAN: 1 x 10/100/1000 Mbps
• WAN: 1 x 10/100/1000 Mbps
• IP Services: Static IP, DHCP, VPN, Firewall, VLAN, DDNS, PPPoE, QoS, Static NAT,STUN
• Voicemail: 10000 min (expandable)
• Firewall: Yes
• T.38 Fax: Yes
• App Center: Yes
• External Storage: SD card and 2.5" SATA HDD
• USB: 1
• Power: AC 100-240V 50/60Hz 1.8A max
• Size: 44 x 25.2 x 4.4 cm (17.3 x 9.9 x 1.7")
• Weight: 2.6 kg (5.73 lbs)
• Power Consumption: 6.2 to 59.1 W
• Environment: 
    Operation Temperature: 0 to 40°C (32 to 104°F)
    Storage Temperature: -20 to 65°C (-4 to 149°F)
    Humidity: 10 to 90% non-condensing
• Mounting: 1U Rack-Mount