YXCALL 2G GSM 16 SIP Voice 256 SIM VOIP Gateway for Call and SMS System

1. Product Overview
The YX GP16-256 is a 2G GSM VoIP/SMS all-in-one gateway, configured with 16 independent GSM communication ports and 8 SIM slots per port, supporting maximum 256 SIM cards in total. Developed with advanced embedded technology, this hardware is purpose-built for core business including Bulk SMS blast, Bulk outbound voice termination, automated USSD query & recharge, third-party platform docking via HTTP API and SMPP 3.4.
Compatible with global 2G GSM frequency bands, the gateway allows mixed deployment of SIM cards from multiple mobile operators across various countries, making it an ideal hardware for SMS aggregators, call center enterprises, self-developed SaaS messaging platforms and fixed-line backup projects.

2. Hardware Specifications
● Port & SIM Layout
Radio Channel: 16 standalone 2G GSM ports, 8 SIM slots per port, total 256 SIM capacity; built-in intelligent SIM group scheduling and cyclic rotation function for all 256 SIMs

● Physical Interfaces & LED Indicator Definition
Network Port: 1×10/100Mbps RJ45 WAN port; default WAN IP:192.168.1.10
Debug Port: 1×USB serial console port (Baud rate:115200, for AT command test & network packet capture)
Power Input: DC 12V 8A, wide-range AC input 100V~240V 50/60Hz
Antennas: 16 external GSM omnidirectional antennas (one antenna per port for stable cellular signal reception)
LED Status Rules:
Steady ON: Corresponding SIM is in active call
Flash every 0.5s: SIM locked by mobile carrier
Flash every 2s: SIM suspended due to insufficient balance/call duration limit

● Working Environment & Warranty
Operating Temp: 0℃ ~ 50℃; Humidity:10%~90%
Official Warranty: 12-month global factory warranty, lifetime free official firmware upgrade

↓ Platform admin panel page display

4. Quick Step-by-Step Installation & Web Configuration Guide
Step1 Hardware Installation
Mount 16 GSM antennas onto corresponding antenna ports of the gateway; insert up to 256 SIM cards into all slots as needed.
Connect RJ45 Ethernet cable from device WAN port to router/switch, link PC to the same LAN network.
Plug DC power adapter to boot up the gateway and check power indicator status.

Step2 PC IP Configuration & Web Login
Set PC IPv4 address as 192.168.1.X (X≠10, Subnet Mask:255.255.255.0).
Open Chrome/Firefox browser, visit http://192.168.1.10; default login credential: Username:root, Password:root.

Step3 Basic Core Parameter Setup
WAN Network: Set Static/Dynamic/PPPoE internet mode under Guider > Initial Setting page.
SIP Configuration: Navigate to Gateway Settings > SIP Setting, input SIP server IP, port, account & password for SIP trunk registration.
SMS & USSD Setup: Configure carrier USSD balance query code and SMS center number under Mobile Settings for automatic balance detection.
Enable SIM auto-protection rules in Automation menu to activate intelligent SIM rotation.
Save all settings and reboot the gateway via System > Save & Reboot.

5. Main Commercial Application Scenarios
Cross-border Bulk SMS Business: Global SMS aggregators use GP16-256 to deploy local SIM channels for OTP verification SMS, marketing bulk SMS, transaction alert SMS via HTTP API/SMPP docking.
Bulk Voice Termination Service: VoIP operators terminate IP calls to global GSM mobile networks for low-cost international outbound voice business.
Enterprise Call Center Solution: Customer service centers deploy the gateway for outbound cold calling and inbound customer hotline reception with flexible SIP docking.
SIM Card Pool Management Project: Telecom service providers connect GP16-256 with remote SIM Bank to centralize massive SIM resource management and centralized bulk USSD recharge.
Self-developed SaaS Platform Integration: Developers access all SMS/USSD/call functions via native HTTP API to build customized proprietary messaging & voice SaaS system.

6. Native HTTP API Integration Details (For Secondary Development)
The gateway opens full open HTTP GET/POST API interfaces to realize remote program control without logging into web admin panel, core API list as below:
Bulk SMS Send API
GET URL: http://GatewayIP/GP_send_sms.html (fill port, account, recipient number, SMS content as URL parameters)
POST JSON API: /GP_post_sms.html, support batch multi-task SMS submission with JSON body format
Receive Inbound SMS API: /GP_get_sms.html, pull received SMS content remotely by custom start ID and quantity
Remote USSD Dispatch API: /GP_send_ussd.html, send USSD command remotely; replace # with %23 in URL parameter, device returns USSD reply content in JSON format

7. Product Competitive Advantages
Ultra-high SIM density: 256-SIM capacity within single 16-port equipment, save cabinet space and reduce overall equipment procurement cost compared with multiple small-capacity GOIP devices.
All-in-one integration: Combine Bulk SMS, Bulk Voice, USSD management and open API in one hardware, no need to purchase separate SMS gateway and voice gateway.
Comprehensive anti-block mechanism: Complete intelligent SIM automatic switch rules greatly lower SIM blocking rate during high-volume bulk messaging & calling tasks.
Flexible docking option: Compatible with mainstream SMS platform, softswitch via SMPP/SIP/HTTP three standard protocols.

8. Package Support

• 12-month warranty

• 24/7 technical support + detailed manuals

• Global Logistics Free worldwide shipping

Essential: Confirm local 2G availability before purchase!

↓ YX Gateway main page to set Gateway display, For other uses, please refer to the instruction manual

Why Future-Proof Flexibility: Scale operations effortlessly with 256 SIM capacity
Cost Efficiency: Reduce telecom expenses via intelligent LCR routing
Reliability: Industrial-grade components for 24/7 uptime

Whatsapp: +8615220722893
Emai: yx@yxinternet.com
Telegram: @YXwendy
Teams: yuexun@yx19999.net

↓ VoIP and SMS gateway connection demonstration

↓ Unscrew the power amplifier casing

↓ Unscrew the switch casing

About Us

YX International is a professional supplier specializing in consumer electronics, smart devices, and lifestyle products. With years of experience in global trade and a strong supply chain network, we provide businesses and end-users with reliable products at factory-direct prices.

Our mission is to bridge quality manufacturing with global buyers, making cross-border sourcing easier, faster, and more transparent. From product selection to quality control, and from fast delivery to after-sales support, YX International ensures every order meets high expectations.

        

Why Choose Us

• Extensive Product Range：From smart electronics to innovative gadgets, we cover a wide range of categories to meet various market demands.
• Direct-from-Manufacturer Pricing：We work directly with reliable factories, ensuring competitive wholesale prices with no hidden costs.
• Strict Quality Control：Every product goes through multi-level quality checks, from factory audits to pre-shipment inspections, guaranteeing what you receive matches your expectations.
• Efficient Logistics Network：With global shipping partnerships, we offer fast and trackable delivery to over 100 countries, keeping your orders on time.
• Dedicated Customer Service：Our professional team is ready to support you before, during, and after your purchase, ensuring your sourcing experience is smooth and hassle-free.

FAQ

1.Who are we?

YX International is a trusted supplier offering consumer electronics, smart devices, connecting global buyers directly with high-quality factories.

2.How can we guarantee quality?

Factory audits to verify production capabilities

Product sampling and testing

Pre-shipment quality checks to confirm product specifications

3.What can you buy from us?

We offer a wide range of products, including:

SMS Modem

SMS Dongle

Voip gateway

SMS gateway
eSIM Gateway
IP Phone
Modules/Accessories

Customized products for bulk orders

4.Why should you buy from us instead of other suppliers?

Direct factory pricing with no middleman markup

Comprehensive quality control from production to delivery

Flexible order solutions for both retail and wholesale

Fast global shipping and reliable logistics

Dedicated after-sales support to resolve any issues

5.What services can we provide?

Product sourcing and customization

OEM and private label support

Product quality inspections

Global shipping coordination

After-sales support and warranty services

1、Overview
VoIP GSM gateway (GoIP gateway) is a device that can reduce the cost of calling mobile networks from fixed telephone lines. It can route directly between IP, digital, analog, and mobile networks. GoIP gateways are increasingly being used by telephone operators to connect IP calls to mobile networks. In areas where fixed line services are unavailable or much more expensive than mobile costs, GoIP gateways are an irreplaceable alternative.

The following figure shows a basic topology of GP Gateway usage.

2、Product Brief
YX series GP Gateway is a multi-functional and high performance product, which is designed with advanced embedded technology. YX series is able to process traditional voice call service and internet data service. perfectly support G729a/b/e、G723.1、G.711 a/u law and iLBC codecs at the same time.
YX series GP Gateway please check the following table about the difference:

3、Appearance

                  

● 4/8/16/32 Antennas
● 1 USB Serial Port (Baudrate 115200)
● 1 Network Interface (RJ45)
● 1 Power Interface (DC 12V 3A/5A/7.5A/8A)
● 1 Power light
● 1 Reset Button
● 4/8/16/32/64/128/256/512 SIM card slots
● 4/8/16/32/64/128/256/512 LED lights

4、Special Features

● Support G729a/b/e,G723.1,G.711 A/U law, iLBC auto-selecting

● BO(Bandwidth Optimization)

● Proxy Encryption Solution for IP Block

● Support SIM Bank

● VPN(pptp)

● SIM Card Rotating

     ◆ SIM card check and switch rules:

        ◇ Accumulated Call Duration

        ◇ Accumulated Connected Calls

        ◇ Accumulated Calls

        ◇ Consecutive Failed Calls

        ◇ Consecutive No-Alert Calls

        ◇ Consecutive No-Answer Calls

        ◇ Consecutive No Carrier Calls

        ◇ Consecutive Short-Duration Calls

        ◇ Consecutive Fast-Alerting Calls Checking

        ◇ Consecutive Fast-Answer Calls CheckingGSM/CDMA/WCDMA/4G(LTE) VoIP/SMS Gateway

        ◇ Consecutive GSM Release Cause Checking

        ◇ Accumulated SMS Count Checking

        ◇ Accumulated Failed SMS Count Checking

        ◇ Consecutive Failed SMS Count Checking

● Station intelligent switching(By switching rules)

● ERMS(Easement Remote Management System)

● Port Inter-Calling

● Fake Ring back

● FAS shield

● Call waiting

● Call Duration Limitation for SIM Card/Single

● Dial Plan/Prefix Inward Translation/Intelligent Routing

● Web Browser: Firefox/Chrome /IE/Opera

5、Specification

6、Mobile Features 

● SMS Send, Receive and Forward(GSM/SIP/HTTP)

● SMS Inbox

● AT Command , USSD

● SMS Format: PDU/TXT

● PIN Code Management

● CDMA Delay Answer

● GSM Polarity Reversal

● Carrier Selection

● Caller ID Hidden(need SIM Card support)

7、Maintenance and Management 

● Multi-language Interface

● USB Serial COM

● Configuration Backup and Restore

● Support HTTP/TFTP Upgrade

● Call statistics: ASR,ACD,PDD

● WEB Remote Management System

● SMPP support

● HTTP Command

▼The following pictures are demo of the platform's interface setup and operation

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8、FAQ

 
Q4. Does GOIP, MOIP, or SMS modem support functions such as MMS, picture SMS, voice SMS, video calls, etc?