Telephony Voice Features Voice Coding G.711, G.723 (5.3, 6.3 kbit/s), G.726 (16, 24, 32, 40 Kbps), G.729, iLBC (13,33 kbit/s , 15,2 kbit/s); (RFC 3951, ITU-T: G711, G.723.1 Annex A, G.726, G729 Annex A; IETF; ITU-T Q.23, Q.24, Bellcore GR.506, GR.181; ITU-T G.168-2000, 2002; ETS_300659_1,2,3) NAT traversal (both manually and STUN) VAD, CNG, G.168 echo cancellation Lifeline POTS (single line)   Bandwidth Requirements Per call WAN bandwidth requirements for the following codecs (non-encrypted/VPN encrypted): G.711a/G.711u 20 msec 84 kbps/105 kbps G.726-16 20 msec 37 kbps/59 kbps G.726-24 20 msec 45 kbps/65 kbps G.726-32 20 msec 52 kbps/74 kbps G.726-40 20 msec 60 kbps/80 kbps G.729a 20 msec 29 kbps/49 kbps G.723 30 msec 21 kbps/34 kbps iLBC 30 msec 27 kbps/41 kbps     PBX Features Call block, forward, hold, ID, park, relay, transfer, wait Voice mail Multilevel auto attendant with Interactive Voice Response (IVR) Directory assistance Distinctive ring, hold music, speed dialing Many extensions ring Hunt group Call statistics Do not disturb service Unified messaging 3-way conferencing Hotline service T.38 fax, fax relay and clear channel fax Unified Fax Messaging Busy auto redial Multiple user extensions (up to 70 physical/virtual extensions)   Call Signaling SIP on the WAN and LAN side (RFCs: 3261, 3263, 3265, 3311, 3428, 3515, 3842, 3856, 3891, 3892, 3581, draft-ietf-sip-session-timer-15, draft-ietf-sipping-dialog-package-05; Presence: RFCs: 3842, 3856, 3863, draft-ietf-sipping-dialog-package-05) SDP (RFC 2327) RTP (RFCs: 1889, 1890, 2833, 3389, 3550, 3551, 3555, draft-ietf-avt-rfc2833bis-05, draft-ietf-avt-rtp-ilbc-o5), in band and out of band signaling support RTP Proxy MGCP with support of the full MGCP business extensions and full screen and soft buttons control of the MGCP phones on the LAN side (RFCs: 3149, 3435, 3660, draf t-foster-mgcp-returncodes-01, PKT-SP-EC-MGCP-I10-040402) H.323 on the LAN side (ITU-T: H.225.0, H.235, H.245,H.323, H.450.x, Q.931, Q.932) Fax over IP (ITU_T: T4, T30, T38, V17, V21, V27 ter, V29)   POTS Signaling Loop start FSK and DTMF Caller ID support   Connectivity Extensions Up to 70 extensions including FXS phones (16), IP phones (up to 48) and virtual extensions) The virtual extensions allow e.g., registering a physical extension at several SIP servers Remote extensions for any physical extension (up to 64)   System Capacity 20 simultaneous VoIP calls with external parties Unlimited station to station calling for IP phones Unlimited station to station calling for analog phones 4 simultaneous PSTN calls with external parties 4 simultaneous calls through a VPN   LAN IP Phones 16 SIP/MGCP phones; 32 additional SIP/MGCP phones may be added per feature key  Remote IP extensions may be enabled for each SIP/MGCP phone   Premise Connections 16 short-loop FXS ports (RJ11) + 1 Ethernet 10/100BASE T port (RJ45) 1 USB master connection   Uplink Connection 4 FXO ports to the Central Office (RJ11) 1 Ethernet 10BASE T (RJ45)   USB Expansion USB memory sticks for additional voice mail storage   Billing Radius Client (RFCS: 2865, 2866)

Internet NAT address translation STUN/NAT traversal (RFC 3489) IPSec VPN with DES and 3DES encryption in tunnel mode (RFCs: 2402, 2406, 2409) PPTP VPN L2TP VPN Manual and automatic IKE key support Firewall security via: Intrusion Detection System NAT (Network Address Translation) Policy and service-based filtering Stateful inspection firewall DHCP server on the LAN side DHCP client on the WAN side DNS server with forwarding functionality SNTP (Simple Network Time Protocol) server/client for computer clock synchronization PPPoE connection to the ISP with PAP/(MS)CHAP authentication IP DIFFSERV for QoS Mail client to send voice messages as e-mail attachments (.wav) and system notifications DNS (DYNDNS) support with third party Port forwarding Port translation   System Management Multilingual WEB interface accessible from LAN and WAN (HTTP/HTTPS), the WAN management access can be switched off Password control Remote diagnostics and software upgrade VoIP Carriers wizard Downoad/restore configuration Legible and editable configuration files Auto-configuration via TFTP Reset button with factory reset option   Diagnostics/Testing LEDs: Busy, Info, Fault, USB, LAN, WAN, Line 1, Line 2 IP Call Quality Rating Remote testing and VoIP diagnostics Power-up diagnostics   Environmental Physical Dimensions Desktop devices, wall-mountable: Measurements: 10.04” x 8.27” x 2.4” (25.5 x 21.0 x 6.1 cm) Weight: 30 ounces (850 g) Rack-mountable devices: Measurements: 19” x 7.56” x 1.77” (48.0 x 19.2 x 4.5 cm) Weight: 9.2 lbs. (4.18 kg)   Conditions 41°F - 104°F (5°C - 40°C) operating temperature 41°F - 140°F (5°C - 60°C) storage temperature 5% - 90% non-condensing humidity   Power Supply Input 100 - 240 VAC; 50/60 Hz; 0.5 A Output 12.0 VDC; 3.5 A   Regulatory Compliance Safety: UL 60950; CSA 22; EMC: FCC Part 15 Class A;   EN55022 Class A, EN55024; Telecom: CTR21/TBR21