4-Channel GSM to VoIP Gateway GOIP SIP ip PBX ip phone: Quad Band SIP Asteris，4-sims GSM VoIP gateway with SIP&H.323 Key Features: • Open Standard VoIP Protocols (ITU H.323 V4 and IETF SIP V2) • Single or Multiple Server Registrations • Two 10/100 Ethernet circuits connect to the LAN and an additional device • GSM module for making GSM calls • Speech quality ensured by QoS at the Ethernet and IP layers and comprehensive jitter buffer • VLAN and QoS support • NAT Transversal and Router functions • Voice prompts, HTTP Web, Auto Provision support for configuration and updates • Highly stable embedded Linux operating system in high performance ARM 9 Processor Basic Features: • LEDs 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 Enhanced Features: • Dynamic selection of codec • Advanced jitter buffer • Automatic traversal of NAT and firewall • VLAN / Qos • Router • Echo cancellation for Speakerphone • Comfort noise generation (CNG) • Voice activity detection (VAD) • Auto provisioning (requires auto provisioning server) • On line firmware upgrade • Multi-language support: English and Chinese Packing： 1 * GOIP-4
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