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24 Port, 32 Port, 4 Port, 8 Port, 16 Port

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Connectors: 2-32 shielded female RJ-11 jacks, Number of ports: 2-32 FXO/FXS configurable, Use multiple gateway units for higher port counts

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Connector: 2 shielded female RJ-45 jack for LAN, Network Interface: 10/100 Base-T Ethernet LAN port

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RTP/RTCP for delivery of voice, SIP per RFC 3261

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T.38 FoIP transcode fax from T.30 fax protocol (supporting V.17) modulation schemes, T.38 for transmission over a packet network

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DTMF detection, and fax tone detection, G.711 μ-Law and A-Law, G.723.1, G.729AB Silence suppression with comfort noise G.168 automatic echo cancellation Call Progress Analysis (CPA), Including Positive Voice Detection, Positive Answering Machine Detection (PAMD)

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From IP to PSTN or from PSTN to IP, IP fault tolerance, IP load balancing, User configuration list of VoIP endpoints

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3 Years From Manufacturer

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FXO, FXS

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Synway

Grandstream

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GXP 1620

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Hold, transfer, forward (unconditional/no-answer/busy), 3-way conferencing, call park/pickup, downloadable phone book (XML, LDAP, up to 500
items), call waiting, call history (up to 200 records), off-hook auto dial, auto
answer, click-to-dial, flexible dial plan, hot desking, personalized music
ringtones, server redundancy & fail-over

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SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS (A
record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDPMED, LDAP, TR-069, 802.1x, TLS, SRTP

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User and administrator level access control, MD5 and MD5-sess based
authentication, 256-bit AES encrypted configuration file, TLS, SRTP, HTTPS, 802.1x media access control

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2 line keys with dual-color LED and 2 SIP accounts. 3 XML programmable
context sensitive soft keys. 5 (navigation, menu) keys. 13 dedicated function
keys for MUTE, HEADSET, TRANSFER, CONFERENCE, SEND and
REDIAL, SPEAKERPHONE, VOLUME

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Support for G.711µ/a, G.722 (wide-band), G.723 (pending), G.726-32, G.729
A/B, in-band and out-of-band DTMF (In audio, RFC2833, SIP INFO)

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English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, simplified and traditional Chinese, Korean, Japanese and more

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FCC: Part 15 (CFR 47) Class BCE : EN55022 Class B, EN55024, EN61000-3-2, EN61000-3-3, EN60950-1RCM: AS/ACIF S004; AS/NZS CISPR22/24; AS/NZS
60950; AS/NZS 60950.1

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Current consumption : Max: 0.4mA, Directivity : Uni – Directional, Frequency : 100Hz—16000Hz, Impedance : Max:2.2kΩ @1kHz, Integrated product Sensitivity : -47±5dB@1KHz 680Ω 1.5V 0dB=1v/pa, Max operation voltage : 10v, S/N ratio : Min: 58dB @1kHz, Standard operation voltage : 3v, Transducer : Electorate condenser microphone (BACK)

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Neodymium Speaker for loud and clear wideband sound, Gimbaled speaker for perfect fit on all head shapes and sizes

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Headsets compatible for Linux, Windows XP, Vista, 7 & 8, Adjustable Surgical Headband for long term flexibility and strength, Flexible geared Bi-Metal Mic Boom for perfect mic positioning and long life