Nu , Power, Ethernet, Voice Status, Phone 1 through 4, Line 1 through 4 , MAC address (IEEE 802.3)IPv4 (RFC 791)Address Resolution Protocol (ARP)DNS A record (RFC 1706), SRV record (RFC 2782)Dynamic Host Configuration Protocol (DHCP) client (RFC 2131)DHCP server (RFC 2131) , Up to 256-bit Advanced Encryption Standard (AES) encryptionWeb browser administration and configuration via integral web serverTelephone keypad configuration with interactive voice prompts , Ring validation time settingTip/ring voltage adjustment settingRing indication delay settingOperational loop current minimum valueRing time-out settingOn-hook speed settingRinger impedance setting , Automatic PSTN fallback (loss of power or IP service to unit, with quiescence to normal operations): fixed fallback pairing of FXS ports to FXO portsAdvanced inbound and outbound call routing , Supports multiple voice codecs: G. 711a, G. 711u, G. 726, G. 729A, G. 723.1SIP over TLS Three-way conference calling with local mixingPer-call authentication and associated routingCall blocking with toll restriction , SIP channels support both User Datagram Protocol (UDP) and TCP transportVPN pass-through with IP Security encapsulating security payload (IPsec ESP), Point-to-Point Tunneling Protocol (PPTP), and Layer 2 Tunneling Protocol (L2TP) , 150 nF complex impedanceFrequency response 300–3400 HzReturn loss (600 ohm, 300–3400 Hz) up to 20 dBInsertion loss (1 Vrms at 1 kHz) 3–4 dBTotal harmonic distortion (THD) (350 mV peak at 300 Hz) up to 3% , Point-to-Point Protocol over Ethernet (PPoE) client (RFC 2516)Internet Control Message Protocol (ICMP) (RFC 792)Transport Control Protocol (TCP) (RFC 793)User Datagram Protocol (UDP) (RFC 768) , Automated provisioning and upgrade via HTTPS, HTTP, Trivial File Transfer Protocol (TFTP)Asynchronous notification of upgrade availability via NOTIFYNonintrusive, in-service upgradesReport generation and event logging , Line-in-use voltage settingPassword-protected system reset to factory defaultPassword-protected administrator and user access authorityProvisioning/configuration/auth entication: HTTPS with factory-installed client certificate , Independent configurable dial plans (1 per port)Force PSTN disconnectionPSTN answer delay timerPSTN-to-VoIP call max duration timerVoIP-to PSTN call max duration timerPSTN dialing delay timer , Delayed disconnectDistinctive ringing: calling and called numberOff-hook warning toneSelective/anonymous call rejection VoIP to PSTN (USA) service call origination and termination , SIP version 2Dual-tone multifrequency (DTMF) tone detection and generationVoice Activity Detection (VAD) Comfort Noise Generation (CNG) compatibleSilence suppressionCall waiting, call waiting caller ID (FXS ports only) , Idle channel noise 72 dB (typical)Longitudinal balance 55 dB (typical)Off-hook threshold (line seizure) Rdc1000 ohmOn-hook threshold (line release) Rdc 10000 ohmRdc DC supervisory range Rdc450 ohm , Real Time Protocol (RTP) (RFC 1889, 1890)Real Time Control Protocol (RTCP) (RFC 1889)Differentiated Services (DiffServ) (RFC 2475), type of service (ToS) (RFC 791, 1349) VLAN tagging (IEEE 802.1p) , Stats in BYE messageSyslog and debug server recordsPer-line and purpose configurable syslog and debug optionsRing voltage: 40–90 Vpk configurableRing frequency: 20–25 HzRing waveform: trapezoidal , HTTP digest-encrypted authentication via MD5 (RFC 1321)Authentication: Extensible Authentication Protocol TLS (EAP-TLS), EAP Tunneled TLS (EAP-TTLS), and Protected EAP (PEAP)SIP over TLS , VoIP dialog refresh interval timerPSTN ring time-out timerFXO port impedance: configurable to 16 settingsRing frequency: configurableSPA to PSTN and PSTN to SPA gain settingsRing frequency: maximum setting , PSTN (USA) to VoIP service call origination and terminationForward calls to VoIP service: selective, authenticated, allForward calls to PSTN service: selective, authenticated, all , Caller ID with name/ numberCaller ID blockingCall forwarding: no answer, busy, allDo not disturbCall transfer, call return, call back on busyFax: G. 711 pass-through or real-time fax over IP via T. 38 fax relay , Simple Network Time Protocol (SNTP) (RFC 2030) Upload data rate limiting: static and automaticQuality of service (QoS): voice packet prioritization over other packet typesMAC address cloningPort forwarding , Maximum ringer load: 5 ringer equivalence numbers (RENs)On-hook/off-hook characteristics:On-hook voltage (tip/ring): -46 ~ -56VOff-hook current: 18–20 mATerminating impedance: 600 ohm resistive or 270 ohm + 750 ohm , 170 x 39 x 220 mm , Switching type (100–240V) automaticDC input voltage: 12V DC at 3.0A max. Power adapter: 100–240V, 50–60 Hz AC input - spa8800


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