Compare

1E1/T1 and 30 SIP channels, 2E1/T1 and 60 SIP channels, 4E1/T1 and 120 SIP channels

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Coder support: G.711A,G.711U, G.729 A/B,GSM, iLBC, RFC 2833,RF 3261,SIPINFO,INBOUND, Comfort noise generation, Compliant with TCP/UDP, HTTP, ARP/RARP,DNS,NTP,TFTP,TELNET,STUN and more IP protocols, Digit transmission via RFC 2833 (SIP), Echo cancellation: G.168 128 ms tail length, Hosted NAT, T.38 real-time fax, T.38 – G.711 interworking, Voice activity detection and packet loss concealment

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Network Time Protocol (NTP), SNMP MIBs, Web User Interface (WebUI) supports configuration via browser

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AC Power Supply Range 100 – 240 VAC, The power supply will operate at frequencies between 47 Hz and 63 Hz

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30 – 120 TDM channels per 1U shelf, 30 – 120 VoIP channels per 1U shelf

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IP Dual redundant 2 – 100/1000 Base-T Ethernet for VoIP payload and signaling

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4 SS7 links in standalone configuration, ISDN PRI, ISDN/SS7, SS7 ISUP, SS7 TCAP

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Core SIP Specifications and Notable Extensions, RFC 3261 SIP Basic, RFC 3262 SIP PRACK, RFC 3265 SIP Subscribe/Notify

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IP and ISUP interworking and more, RFC 3398 ISUP/SIP Mapping, RFC 3711 SRTP (for SIP), Tel URI – RFC 3966

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3 Years From Manufacturer

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Synway

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Adjustable Headband, Dual earpiece headband with bigger size, Durable, light weight, robust., Flexible Plastic Mic Boom for clear transmission, For RJ JACK/ USB with QD connector optional, Headsets for VOIP, Dialers, Soft Phones & Hard Phones, Soft leatherette ear cushions for all day comfort

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Easily Repairable ( with full parts available ), Impedance : 32-150 ohms, Leatherette ear cushions available., Optional Quick Disconnect Jack, Plastic and Rubber MIC Boom Assembly for clear transmission, SPL (at 1 kHz, 1 Vrms) : 100 dB, Stay-put click-stop headband for a perfect fit.

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•Type : Bidirectional, Frequency Response : 80 ~ 6500Hz, Impedance : 2.5 K Ohms, Pick up Pattern : Noise Cancelling, Type : Bidirectional