Illegal wiretapping poses ever bigger risks to the confidentiality of voice communication, as the respective technical effort has even become less complex with the advent of Voice over IP (VoIP) and GSM networks. So-called IMSI-catchers are available on the market which fake a base station towards a mobile phone and can thus be used for a man-in-the-middle attack. Other attackers focus directly on the internal network of a GSM provider to catch many more calls as they pass the respective switches. This danger becomes especially very real when road warriors travel in less secure or trustworthy areas around the world.

Up to now, the market predominantly offered isolated stand-alone products for voice encryption in one single network that required identical, specialized end user devices. This has constrained the broad and easy use of such technology. Hence the Nabishi GSM  Encrypted Gateway combines secure mobile communications with existing land line devices based on VoIP or ISDN technology.

The Nabishi Encrypted Gateway connects encrypted calls between secure mobile phones and any standard phone set acting as an extension of a private branch exchange within an organisation. This ensures that outsiders are always faced with fully encrypted voice calls while at the same time ensuring that any extension within the organisation can be used to communicate with secure mobile phones. This effectively prevents unsecure connections via the GSM or public fixed telephone network.