 1 Port GSM VOIP Gateway (Model: WT-2201)
The WT-2201 GSM VoIP Gateway enables direct routing between IP and GSM network without the use of a FXO port or the PSTN network.It is the GSM network and the VoIP network connecting seamlessly new poducts. Mobile phone SIM card will be installed in the device, and WT-2201 users can be achieved through the GSM network on the car aligh.It bulit-in SIP and H.323, configuration flexibility. SIP can be thoroughly used when electricity came display unbers. With this WT-2201, the usage of VoIP is greatly enhanced with significant savings on long distance and roaming charges.
Appearance
 LAN - Connect this port to an Ethernet Switch/Router, the Ethernet of a DSL modem, or other network access equipment.
PC - Connect a computer or other network device to this port.
POWER (DC4.5V/2000mA) - Connect the 4.5V/2000mA Adapter provided to this power jack.
Reset - Press this button to reset the WT-2201 GSM VoIP Gateway to factory defaults
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
 - DTMF: RFC 2833, In-band DTMF, SIP INFO
Protocol
- TCP/IP V4 (IP V6 auto adapt)
- ITU-T H.323 V4 Standard
- H.2250 V4 Standard
- H.245 V7 Standard
- H.235 Standard（MD5，HMAC-SHA1）
- ITU-T G.711 alaw/ulaw, G.729A, G.729AB, and G.723.1 Voice Codec
- RFC1889 Real Time Data Transmission
- Proprietary Firewall-Pass-Through Technology
- SIP V2.0 Standard
 - Simple Traversal of UDP over NAT (STUN)
- 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 MD5
- Out-band DTMF Relay: RFC 2833 and SIP Info
Software Specifications
- LINUX OS
- Built-in HTTP Web Server
- PPPoE Dial-up
- NAT Broadband Router Functions
- DHCP Client
- DHCP Server
- Firmware On-line upgrade
- PSTN Caller ID transmit
- Multiple Language Support
- Supported call divert
- Supported PSTN auto call out to PSTN
- Supported Multi_devices Cooperate Mode(Group Mode)
- Supported SMS call out
Hardware Specifications
- Characteristics of the hardware and Parameters
- Processor : ARM9E 133MHz
- DSP :VPDSP101 95MHz
- RAM: 8M
- Flash : 4M
- Power : DC4.5V/2000mA +-10% Input AC100V to AC240V
- GSM Module Type: Default 900M/1800M Optional: 850M/1900M Must Customize
- Consumption: The Maximum 3 W
- LEDs : RUN, GSM, LAN, PC
- Network Ports: 2 with 100/10BASE-Tr
- Working Temperature: 0－40℃
- Working Humidity: 40％－90％ Not Congealed
- Colour : Blue
- GSM SIM Ports: 1
- VoIP Channels: 1
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