YX GP 4G VoIP Gateway: SIP Calls, SMS API, MMS & SIM Rotation

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YX GP 4G Gateway: One Device for SIP Calls, SMS API, MMS & Anti-Block SIM Rotation

By yxinternet August 25th, 2026 16 views

● YX GP Series Gateway: The All-in-One 4G VoIP & SMS Solution Your Business Needs

If you run a call center, an SMS service, or any business that needs to connect mobile networks with your phone system, you have probably asked yourself: is there one device that can handle voice calls, SMS, MMS, and API integration all at the same time?

The answer is yes — and it is the YX GP Series Gateway.

In this article, we will walk you through what this gateway does, how it is built, and why customers around the world choose YX. By the end, you will know exactly whether it is the right fit for your business.

● What Is the YX GP Gateway?

Put simply, the YX GP Gateway is a bridge between the mobile cellular network and your internet-based phone system (VoIP). You insert regular SIM cards into the device, and it converts mobile voice and text traffic into IP data that your server can understand — and vice versa.

This means you can:
- Make and receive phone calls through mobile SIM cards using your existing SIP server
- Send and receive SMS and MMS programmatically via HTTP API
- Check SIM balance with USSD commands
- Run all of this at the same time, on every channel

It works with popular platforms like Asterisk, Vicidial, and any standard SIP-based softswitch.

● Key Features That Matter to Our Customers

We talk to customers every day, and certain questions come up again and again. Here is how the GP Series answers them.

1. SIP / VoIP Support — Yes, and It Is Standard

The gateway fully supports SIP 2.0 (RFC3261), the industry standard for internet telephony. You can use it in either registration mode or point-to-point (SIP Trunk) mode. It works out of the box with Asterisk, Vicidial, FreeSWITCH, and most commercial softswitches.

Supported voice codecs include:
- G.711 a-law / u-law
- G.729a / b / e
- G.723.1
- iLBC

It also includes echo cancellation, silence suppression (VAD/CNG), and an adaptive jitter buffer — all designed to keep calls clear and stable, even on busy networks.

2. SMS, MMS, and HTTP API — Built Right In

Every GP gateway comes with a complete HTTP REST API for sending and receiving SMS. You can trigger an outbound SMS from your server with a simple HTTP request, and incoming messages are pushed to your URL in real time. This makes it perfect for OTP verification, notification services, and two-way messaging.

The device also supports SMPP 3.4, the standard protocol for high-volume SMS delivery. MMS is supported as well, with per-SIM APN and MMSC configuration so you can match the requirements of any carrier.

Need to check how much credit is left on a SIM? The built-in USSD feature lets you send balance-query commands manually or on a schedule, and the results are available through the web interface or API.

3. Multiple SIM Cards and Smart Rotation

One of the biggest advantages of the GP Series is its flexible SIM capacity. Models range from 4 channels with 4 SIMs all the way up to 32 channels with 512 SIMs.

For example, the GP 16-256 has 16 independent voice channels and 256 physical SIM slots — that is 16 SIMs per channel, which the device can rotate through automatically.

Why does this matter? Because mobile carriers watch for unusual traffic patterns. The gateway includes a powerful set of anti-block automation rules, such as:
- Switching SIMs after a set number of failed calls
- Locking a SIM after too many short-duration calls
- Rotating based on accumulated call time or SMS count
- Detecting fast-answer or fast-alert patterns that can trigger carrier flags

These rules help you spread traffic across your SIM pool and reduce the risk of cards being suspended.

4. IMEI Management

Each SIM port has its own independent IMEI, and you can modify or regenerate IMEIs as needed. This is another tool in the anti-block toolkit — it lets each SIM present a unique device identity to the network.

5. VoLTE and 4G LTE

All 4G models support VoLTE (Voice over LTE), and you can set the VoLTE mode per port — Auto, Disabled, or Forced. This gives you HD-quality voice on 4G networks where available.

A quick note on wideband audio: the mobile side can use HD voice, but on the SIP/RTP side, the gateway currently transcodes to G.711. AMR-WB, G.722, and Opus are not yet supported on the SIP leg.

6. VPN and Remote Deployment

If your call server is in the cloud and your gateway is on-premise, you do not need a public IP at the office. The gateway supports VPN (PPTP) and can connect to your server by domain name. STUN NAT traversal is also built in, making remote deployments straightforward.

7. Concurrent Voice and SMS on the Same SIM

Yes — a single SIM can be on an active voice call and still send or receive SMS at the same time. The voice and data channels operate independently, so you do not have to choose one or the other.

8. Real-Time Statistics and Monitoring

The web dashboard shows live call status, signal strength, carrier information, and balance for every SIM. You also get key call-center metrics like ASR (Answer Seizure Ratio), ACD (Average Call Duration), and PDD (Post Dial Delay) — everything you need to monitor performance and spot issues early.

● How Is It Built? Build Quality You Can Trust

The GP Series is designed for 24/7 operation in professional environments. Here is what goes into every unit.

Industrial-Grade Hardware
Each channel runs on its own dedicated cellular module, so there is no shared bottleneck. Even with all channels active at once, every call and every SMS gets full processing power.

Rack-Mount Metal Chassis
The device is housed in a sturdy metal case built for standard 19-inch server racks. It dissipates heat efficiently and is designed to run continuously at temperatures from 0°C to 50°C (32°F to 122°F).

Clean, Reliable Power
A wide-range power adapter (100–240V AC input) handles different country standards, and the internal power regulation protects the modules from voltage spikes.

Thoughtful Layout
Front-facing SIM slots and LED indicators make it easy to see the status of every card at a glance. A USB console port is available for advanced debugging, and a single RJ45 WAN port handles all network traffic.

Every unit is tested before it leaves the factory — SIM detection, call setup, SMS delivery, network registration, and web interface access are all verified. We do not ship a device we would not deploy ourselves.

● Shipping and Logistics: Fast, Tracked, Worldwide

We know that when you place an order, you want to know when it will arrive. Here is how we handle delivery.

- Global courier shipping via DHL, FedEx, or UPS — fully tracked from our warehouse to your door
- Typical delivery time is 7 to 12 business days, depending on your location and customs clearance
- Secure packaging with anti-static protection and reinforced corners to prevent damage in transit
- Shipping cost is quoted separately based on destination and package weight, so you only pay what the courier actually charges

For customers in Philippines, the UK, the US, and most other countries, we have shipped hundreds of units and know the customs process well. We provide all the documentation you need for smooth import clearance ((Some countries offer dedicated logistics channels that include tax and customs clearance.)

● After-Sales Support: We Are With You After the Sale

Buying the hardware is only the first step. Getting it configured and running smoothly is where real support matters.

12-Month Warranty
Every GP gateway comes with a 12-month factory warranty covering manufacturing defects. If a unit fails due to a hardware issue, we will repair or replace it.

Free Remote Technical Support
Our technical team is available to help you with:
- Initial setup and SIP configuration
- API integration and SMS testing
- Troubleshooting call quality or registration issues
- Firmware updates

We can connect remotely or guide you step by step over chat and email. Most configuration issues are resolved within one session.

RMA Process
If a device needs repair, simply contact our support team with the device serial number and a description of the issue. We will diagnose it remotely first — many problems are firmware or configuration-related and can be fixed without shipping anything back. If hardware repair is needed, we will walk you through the return process.

Documentation and Resources
Every customer receives the full user manual, the HTTP API documentation. If you are a developer integrating the API, our team can answer technical questions directly.

● Why Choose YX?

There are other gateways on the market. Here is what makes YX different.

A Complete Feature Set, Not a Partial One
Some gateways handle voice well but have no SMS API. Others do SMS but lack the anti-block automation that high-volume users need. The GP Series does it all — voice, SMS, MMS, USSD, SIP, SMPP, HTTP API, SIM rotation, IMEI management — in one device.

Built for High-Volume, Real-World Use
The SIM rotation system, anti-block rules, and per-port independent modules are not afterthoughts. They are core features designed for call centers and SMS providers who push traffic every day.

Flexible Models for Every Scale
Whether you need 4 channels for a small operation or 32 channels with 512 SIMs for a large deployment, there is a GP model that fits. And because they all run the same firmware and web interface, moving up to a larger unit later is seamless.

Transparent Pricing, No Hidden Fees
What we quote is what you pay for the hardware. There are no per-channel license fees or recurring software charges — the API and all features are included.

● Ready to Get Started?

If you are still reading, you are probably the kind of person who likes to know the details before you buy. We respect that.

Here is what to do next:
1. Tell us your use case — how many channels do you need, which country will the SIMs be from?
2. We will recommend the right model and confirm that the 4G frequency bands match your local carriers.
3. Place your order — we ship within 1–2 business days and send you a tracking number.
4. We help you set it up — free remote support until your calls and SMS are flowing.

Visit yxinternet.com or reach out to our sales team today. Let us build a solution that works for your business.

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YX GP 4G Gateway: One Device for SIP Calls, SMS API, MMS & Anti-Block SIM Rotation

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