1 Channel GSM Gateway

• Call from VoIP to GSM or GSM to VoIP

• Bulk SMS

• Auto check balance and recharge

• Remote SIM Control

• Outbound call from voip

• Inbound call from gsm

• Remote management

•  GSM Channel: 1

•  Power Adapter: DC 12V/500MA

•  CPU: ARM9/300MHz

•  RAM:16MB

•  Flash:4M
  

•  GSM Frequency: 850/900/1800/1900MHz

•  Max power consumption: 5W

•  Net weight: 0.15KG

•  Size: 13*10*2.6cm

•  Operating Temperature: 0 - 45℃

•  Working Humidity:  10% - 90% non condensation

• VoIP Protocols: SIP V2, H.323 V4

• Audio Codecs: g711(alaw/ulaw), g729, g723.1

• DTMF format: SIP INFO, RFC2833, Inband

• Packet Loss Concealment

• Programmable Jitter Buffer: Fixed, Dynamic, Adaptive

• Network Connection: DHCP, PPPOE, Static IP

• STUN Server

• Support English, Chinese

• Support Signaling encryption

• Support media encryption

• Support Media NAT Traversal

• Support Remote control

The concept diagram below shows a simple VoIP network for call center application.  It consists of a softswitch/IP PBX and VoIP clients such as an IP phone, a call center operator, and GoIPs.  All VoIP clients are configured to register to the softswitch/IP PBX.  For the GoIPs, each GSM channel is inserted with a valid SIM card in order to access the GSM network.  Both incoming and outgoing calls between the VoIP and GSM/PSTN networks can now be realized.