1 channel GSM VOIP gateway

one channel GSM VOIP gatewayProduct OverviewThe 1-portGSM Gateway (GoIP1)bridges the GSM services and the IP networks. It is ideal for VoIP to wireless services where a fixed telephone line (PSTN) is not available or for cellphone roaming via the a VoIP network. The GoIP1brings mobility, scalability and significant savings on long distance charges.The GoIP1 has the following key featuresProvide one cellular channels for IP-PBX Support open standard SIP Protocols (IETF SIP V2) Support SIP proxy mode Multiple GoIP1 grouping mode Two 10/100 Ethernet ports for the LAN and an additional device Quad band GSM module: support GSM 850MHz, 900 MHz, 1800 MHz, 1900MHz Speech quality ensured by QoS at LAN, IP layers and comprehensive jitter buffer VLAN and QoS support NAT Transversal Voice prompts, HTTP Web Highly stable embedded Linux operating system in high performance ARM 9 Processor Enhanced FeaturesLEDs for Power, Ready, Status, WAN, PC, GSM Call forward from GSM to VoIP and VoIP to GSM Dial in mode or dial out mode only Dial Plan Password protection for both GSM dial in or dial out Retransmit GSM Caller ID to VoIP terminal Dynamic selection of codecs Advanced jitter buffer Automatic traversal of NAT and firewall VLAN / Qos Echo cancellation for Speakerphone Comfort noise generation (CNG) Voice activity detection (VAD) Auto provisioning (requires auto provisioning server) Firmware upgrade from GUISupported StandardsRFC 1889 - RTP/RTCP RFC 2327 - SDP RFC 2833 - RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals RFC 2976 - SIP INFO Method RFC 3261 - SIP RFC 3264 - Offer/Answer model with SDP RFC 3515 - SIP REFER Method RFC 3842 - A Message Summary and Message Waiting Indicator RFC 3489 (STUN) - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs) RFC 3892 - SIP Referred-By Mechanism Proprietary Firewall-Pass-Through Technology Codec: G.711 (A/µ law), G.729A/B, G.723.1 DTMF: RFC 2833, In-band DTMF, SIP INFO Web-base Management PPP over Ethernet (PPPoE) PPP Authentication Protocol (PAP) Internet Control Message Protocol (ICMP) TFTP Client Hyper Text Transfer Protocol (HTTP) Dynamic Host Configuration Protocol (DHCP) Domain Name System (DNS) User account authentication using MD5Hardware SpecificationsProcessor: ARM9E 133MHz DSP: VPDSP101 95MHz Memory: RAM 8MB/ Flash 4MB GSM Module: Type: 850MHz, 900MHz, 1800MHz, 1900MHz Power: Input AC100V 240V, output 12 Vdc 500 mA Power consumption: 3W maximum Operating temperature: 10°C to 40°C (32°F to 104°F) Storage temperature: 0°C to 50°C (32°F to 122°F) Working Humidity: 40% 90% Not congealed Weight: 500 g (1 lb) (Including AC/DC Adapter) Warranty: 1 year on hardware