Hot voip product! 4 ports gsm voip gateway,iax2 voip gateway

Key Features

• Multiple GoIP4 grouping mode
• Provide one cellular channels for IP-PBX
• 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 

Hardware Specifications

• Processor: ARM9E 133MHz
• DSP: VPDSP101 196MHz
• Memory: RAM 16MB/ Flash 4MB
• GSM Module: Type: 850MHz, 900MHz, 1800MHz, 1900MHz
• Power: Input AC100V ~ 240V, output DC12V/2A +-10%
• Power consumption: 32W maximum
• Network card: 100/10Base-T x2
• LED: Operation and lines light
• GSM Passway:eight
• Operating temperature: 10°C to 40°C (32°F to 104°F)
• Weight: 2000g (1 lb) (Including AC/DC Adapter)
• Warranty: one year