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1,4 sim card Used GSM VoIP gateway
2,support IMEI change
3,have encryption built-in
4,call back and SMS
5,H.323 and SIP


4 GSM SIP VoIP  gateway Description

The GSM Fixed Wireless Terminal  4 ports Gateway GoIP-4 is a  4 SIM Card Broadband Phone Gateway that had been developed by CHINASKYLINE Ltd. GoIP_4 SIM Card Broadband Phone Gateway is a new product that connect the GSM and the VOIP seamlessly. To GoIP_4 what is installed on the Mobile SIM Card, you can register the GSM telephone on the VoIP soft switch. SIP and H.323 agreement are built in the GoIP_4 and configured flexible. Caller ID can be seen by using SIP. Flexible routing can meet the need of all kinds of call forwarding; even more special is that GoIP_4 support multi-device group, it can be easily combined into arbitrary number of channels of Large Gateway Group. 

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 95MHz
• Memory: RAM 8MB/ Flash 4MB
• GSM Module: Type: 850MHz, 900MHz, 1800MHz, 1900MHz
• Power: Input AC100V ~ 240V, output 12 Vdc 500 mA
• Power consumption: 12W maximum
• Operating temperature: 10°C to 40°C (32°F to 104°F)
• Storage temperature: 0°C to 50°C (32°F to 122°F)
• Working Humidity: 40% ~ 90% Not congealed
• Weight: 450 g (1 lb) (Including AC/DC Adapter)
• Warranty: one year

Concrete the technical protocols of GoIP_4 are as follows:

Free roaming:

In order to promote our product ,Now we have added some new funcitions in  GoIP.By adding the new funcitions,you can build the call without using the softwhich or platform,just depending on the internet.it makes our calls more convenient and easier.what’s more, it can save a lot of call fee.Here is the following example:

Example: 

1 PSTN to VoIP:

Description:using the GoIP to connect with VoIP.

2 VoIP to PSTN:

Description: using the GoIP to connect with PSTN.

3 Calling forward

Description:If you are in china but your main business is in Malaysia, you only put a
Malaysia SIM card into the GoIP.In this condition,all calling the SIM number can

connect your Phone number in China directly.

4 calling back

Description:When you are using the telephone, and you are want to get  preferential from VoIP Phone anytime and anywhere.You just call the SIM card number which in GoIP,the calling number would send to Server by GoIP,then the server receive the calling number and establish the new calling.Then you will receive the new calling,you just accept the calling,Now you are calling with your customer by server.