32-Channel GSM Gateway with 4SIM/channel

• GSM Channels：32 ports

• Power Adapter: DC12V/4.5A

• CPU: ARM11/700MHz

• RAM: 128M

• Flash:  8M

• GSM Frequency: 850/900/1800/1900MHz

• Max power consumption: 38W

• Net weight: 4.5KG

• Size: 51*41*4.7cm

• Operating Tempreture: 0-45℃

• Working Humidity:  10%-90% non condensation

• Soft Features

• 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.