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Hi, I am Businessman I found this sample from https://www.indomonster.com and think it might be useful to you. ------------------------------------------------------- DINSTAR DWG2004 VOIP GSM GATEWAY CAPACITY 8 GSM CHANNEL Dinstar DWG2008 SIP/ GSM gateway with 8 GSM channels Applications: SIP IP PBX GSM Trunk, SIP VoIP line Gateway, SMS Server Quad-Band GSM 850/ 900/ 1800/ 1900 MHz 1 year warranty against hardware defects Product Overview More calls than ever are being made/ received using mobile phones, especially with the explosion of Smartphone' s and flexible/ home working. The 1U rack mountable DWG2008 SIP/ GSM Gateway from Dinstar is a cost-effective SIP/ GSM gateway for SMEs and system integrators, and also opens up new revenue generating opportunities for service providers. The DWG2008 allows a SIP based IP PBX telephone system or VoIP line to be connected directly to the GSM cellular network, which can dramatically lower the cost of mobile calls by taking advantage of lower mobile-to-mobile tariffs. The DWG2008 is a Quad-band SIP/ GSM gateway that supports 8 GSM channels / SIM cards. The DWG2008 works with Asterisk® based IP PBXs like Elastix® , trixbox® , and AsteriskNOW® , as well as other Open Source and proprietary SIP based IP PBXs, Switch, IVR, and VoIP gateway application Voice codecs supported include G.723.1, G.729A/ B, G.711 ( a-law and u-law) Support for Fixed IP, DHCP, Automated NAT traversal using IETF STUN Protocols supported include SIP RFC3261, TCP/ UDP/ IP, RTP/ RTCP, HTTP, ARP/ RARP, ICMP, DNS, DHCP, NTP, TELNET, PPPoE, STUN Support for 8 GSM channels 1 hot-plug SIM card per GSM channel Quad-Band GSM 850/ 900/ 1800/ 1900 MHz Send/ receive batch SMS up to 300 characters, support for AT commands Unstructured Supplementary Services Data ( USSD) support Adjustable TX/ RX gain: -6db~ + 6db Offhook Auto-Dial Hotline service DTMF Signaling via RFC 2833 or SIP Info Built-in PPPoE client for establishing DSL link connection with ISP Quad 10/ 100 RJ45 ports, support router and bridge mode LEDs provide operational status information Support for external antenna PIN support for locked SIM cards Enhanced ( Carrier Grade) Echo Cancellation: ITU Rec. G 168, up to 128 ms tail size Adaptive Jitter Buffer, Packet loss concealment ( PLC) , Comfort noise generation ( CNG) , Voice activity detection ( VAD) HTTP Web configuration support For detailed information, please go to http://www.indomonster.com/limkoindonesia/3161433
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