GSMK CryptoPhones support two different types of technology to transport the encrypted voice stream from one party to the other – CSD and IP. The modes of transport available with each product are clearly labeled on the brochures and specifications.
The classic CryptoPhone uses the so called Circuit Switched Data mode (CSD) in all modes that can be found in GSM networks – transparent and non-transparent as well as V.110 and V.32. CSD offers a reliable and cheap way to use the CryptoPhone in most countries. CSD calls are usually billed the same way as unencrypted voice calls are billed.
To provide a second option for countries where CSD is not available, GSMK has introduced the CryptoPhone IP series, which uses any form of wireless IP (internet protocol) network available. With CryptoPhone IP devices you can connect via GPRS, EDGE, 3G, WiFi or satellite devices that provide IP networking. To use CryptoPhone IP with EDGE or 3G networks, a data flat rate contract is strongly recommended. When you are traveling, you can plug in a data-enabled local SIM card and can still be reached on your CryptoPhone IP number.
Interoperability between CryptoPhones using CSD and CryptoPhone IP is available by means of a gateway component that can be purchased separately. Since the underlying CryptoPhone Protocol is the same for IP and CSD, the gateway does not touch the encryption and just translates between IP and CSD. Your secure calls are always encrypted end-to-end, despite of using different modes of transport.