IoT Devices
Secure VoIP Bridge
GSM to Wi-Fi, Ethernet & USB Communication Gateway
Embedded Linux platform for secure VoIP communication featuring hardware-based key protection, industrial-grade reliability and custom embedded hardware. Forward incoming calls and SMS from your SIM card and securely access your GSM number from anywhere in the world.
Embedded Linux Platform based on Microchip SAMA7
Secure VoIP with Protected Hardware Key Storage
Connectivity Interfaces: Wi-Fi, Ethernet, USB in compact multilayer PCB
High-Density PCB, 8-layer PCB, 800 components, 2000 pads, 3000 vias
Small Size
Size of the plastic enclosure is 120mm x 40mm, height 35mm
Battery powered
Low consumption, the bridge should active works up to 4 hours
Communication interfaces
Wi-Fi (2.4, 5GHz), 1G Ethernet, USB type-C, Ethernet, Bluetooth
nanoSIM & eSIM cards
Wireless module SIMCOM GSM/LTE + eSIM + ext. nanoSIM card
Power Supply
Powered by any USB Type-C source with a power output of 10W
Secure MCUs
Storing encryption keys in secure microcontrollers without access
Engineering at a Glance
Project Overview
Forwarding incoming calls and SMS from your SIM card. Access to mobile numbers from anywhere in the world. Calls to the SIM card are made via the usual unencrypted GSM channel. Users can access to GSM numbers from anywhere in the world at any time. The small display shows information about the GSM connection, signal strength and connection to bigpond. Forget about carrying multiple phones or paying for international roaming. The operator will not be able to triangulate the location of youe phone, the architecture helps protect user privacy by allowing the SIM card to remain in a fixed secure location while users communicate remotely..
Connects to the Internet via an Ethernet cable or Wi-Fi. It can be connected to any home or office router. Encryption keys are generated internally by the device. Encryption keys are stored inside a dedicated secure microcontroller. When opening the case, the keys are erased. The exchange of your keys, as well as the configuration are carried out using NFC. Just attach the phone to the box and it will be set up. Therefore, you are the only person who can reconfigure it.
Connects to the Internet via an Ethernet cable or Wi-Fi. It can be connected to any home or office router. Encryption keys are generated internally by the device. Encryption keys are stored inside a dedicated secure microcontroller. When opening the case, the keys are erased. The exchange of your keys, as well as the configuration are carried out using NFC. Just attach the phone to the box and it will be set up. Therefore, you are the only person who can reconfigure it.
Engineering Challenges
✔ Compact consumer Form Factor
Designing a compact enclosure 120 × 40 × 35 mm, with a complete embedded Linux communication platform and integrating SoC, wireless modules, battery, and display.
✔ Battery-Powered Operation
Achieving up to 4 hours of continuous voice communication on a rechargeable battery through efficient power management and low-power architecture.
✔ Secure Voice Communication
Implementing encrypted VoIP communication with secure software architecture, reliable networking and hardware-assisted system protection.
✔ High-Density HDI PCB Design
Integrating a high-performance application processor, wireless modules, Ethernet PHY, audio codecs, power management on an 8-layer HDI PCB.
✔ Multi-Interface Connectivity
Supporting Wi-Fi (2.4 & 5 GHz), Gigabit Ethernet, USB Type-C and Bluetooth while maintaining stable communication, signal integrity and industrial reliability.
✔ Embedded Linux Platform
Porting and customizing Embedded Linux including BSP, bootloader, kernel, device drivers, hardware bring-up and system validation for production-ready operation.
Key Parameters
Interfaces:
▪️ CPU – Microchip SAMA7
▪️ 1 x DDR2, 128MB
▪️ 1 x SIMCOM GSM/LTE + eSIM + ext. SIM
▪️ 1 x Wi-Fi 2.4Ghz, Bluetooth with chip antenna
▪️ 1 x 1G Ethernet (using USB type-C connector)
▪️ 1 x Crypto MCUs for keys
▪️ 2 x NOR flash memory
▪️ LCD, Audio codec
▪️ TRNG, Accelerometer
▪️ Power supply 5V, 10W
▪️ CPU – Microchip SAMA7
▪️ 1 x DDR2, 128MB
▪️ 1 x SIMCOM GSM/LTE + eSIM + ext. SIM
▪️ 1 x Wi-Fi 2.4Ghz, Bluetooth with chip antenna
▪️ 1 x 1G Ethernet (using USB type-C connector)
▪️ 1 x Crypto MCUs for keys
▪️ 2 x NOR flash memory
▪️ LCD, Audio codec
▪️ TRNG, Accelerometer
▪️ Power supply 5V, 10W
PCB:
▪️ Stackup – 8 layers
▪️ PCB – 800+ components
▪️ 2500+ pads
▪️ 3000+ vias
▪️ High-density multilayer PCB
▪️ Stackup – 8 layers
▪️ PCB – 800+ components
▪️ 2500+ pads
▪️ 3000+ vias
▪️ High-density multilayer PCB
Project Results
ATEH.tech delivered a complete hardware platform from concept to functional engineering prototypes, including:
✔ Hardware architecture
✔ Schematic design
✔ Mechanical enclosure design
✔ Prototype manufacturing
✔ Embedded Linux (Buildroot)
✔ Linux kernel porting
✔ Device Tree development
✔ Driver development
✔ Firmware for secure microcontrollers
✔ Manufacturing support
✔ Board bring-up
✔ Functional validation
✔ Production-ready engineering samples
✔ Hardware architecture
✔ Schematic design
✔ Mechanical enclosure design
✔ Prototype manufacturing
✔ Embedded Linux (Buildroot)
✔ Linux kernel porting
✔ Device Tree development
✔ Driver development
✔ Firmware for secure microcontrollers
✔ Manufacturing support
✔ Board bring-up
✔ Functional validation
✔ Production-ready engineering samples
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