GSMK Cryptophone PBX Gateway

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GSMK Cryptophone PBX Gateway

Integrate CryptoPhone voice encryption into existing IP PBX environments

The GSMK CryptoPhone PBX Gateway is a compact all-in-one appliance for implementig seamless encrypted
communication between headquarters and the mobile workforce all over the world. Large enterprises as well as government agencies need their members to be able to work together efficiently and securely in a closed user group. While mobile users and remote offices can easily be equipped with individual GSMK CryptoPhone secure mobile, satellite and desktop phones, enabling large headquarters with hundreds of extensions to communicate securely can be a logistical challenge

The Solution

With the GSMK CryptoPhone PBX Gateway, one single all-in-one appliance connected to your existing IP PBX
gives your entire workforce access to encrypted calling. Deployed extensively in enterprise headquarters,
government departments and embassies around the globe, the GSMK CryptoPhone PBX Gateway allows
entire headquarters to communicate securely with managers, engineers, ambassadors and agents overseas.


The GSMK CryptoPhone PBX Gateway offers a striking value proposition by combining low investment costs
with substantially increased speed and process efficiency.


The GSMK CryptoPhone PBX Gateway is based on Erlang as the international standard for professional
carrier-grade telecommunication equipment.


The GSMK CryptoPhone system uses the strongest and most secure algorithms available today: AES256 and
Twofish with 256 bit effective key length and 4096 bit Diffie-Hellman key exchange. The encryption key is
destroyed as soon as the call ends, and no log files are kept on the switching equipment.


GSMK supports its customers before, during and after deployment with an advanced requirement analysis, full
deployment support, training, and tailor-made SLAs.

Lab Version

Lab versions are available for testing and maintenance purposes.

System Key Features

  • Seamless encryption between mobile, satellite, landline and PBX connected phones
  • Use PBX added features and conferencing
  • Connection to any PBX via SIP-Trunk
  • Graphical UI - intuitive system handling
  • Up to 100 parallel simultaneous connections
  • Lowest bandwidth on the market: 4.8 kbit/s
  • Works even under adverse network conditions
  • High-end industrial grade hardware for easy deployment (HP Pro Liant 360 Gen9)
  • Custom SLAs on request

System Architecture GSMK 360° Encryption

GSMK System Architecture Encryption

Technical Data

GSMK CryptoPhone PBX Gateway

GSMK CryptoPhone PBX GatewayHigh-grade applicance, HP ProLiant, Gen9, Intel Xeon
ES-2600 v3, DDR4 SmartMemory, SSD drives and dual PSU


331i Ethernet Adapter, 4x1GBit for M2M (maintenance), SIP and Cryptophone IP connection

Industry Standard Compliance

  • ACPI 2.0b Compliant
  • PCIe 3.0 Compliant
  • PXE Support
  • WOL Support
  • USB 3.0 Support
  • Energy Star
  • ASHRAE A3/A4


1U Rack form factor, Width 43,47cm (19“), Length 70cm (27.5“), 12.25 kg

Hardware Warranty

HP 3 years limited warranty on parts and labour

Concurrent connections

100 simultaneous calls


AES256 and Twofish with 256 bit effective key length and 4096 bit Diffie-Hellman key exchange. The encryption key is destroyed as soon as the call ends, and no log files are kept on the switching equipment.

Voice Codec

ACELP VLBR4 codec (towards Cryptophones)


  • SIP and SIPS support (RFC 3261)
  • RTP and SRTP support (RFC 3550 and RFC 3711)

Compatibility Overview

GSMK Cryptophones

  • Cryptophone Mobile Generation 4xx, 5xx, 500i, 6xx
  • Cryptophone Desktop Phones IP19, IP19i
  • Cryptophone Satellite Phones

PBX Appliances and protocols

  • Cisco Call Manager
  • Asterisk 11.x based appliances
  • others upon request

GSMK - Cryptophone PBX Gateway