Satellite phone users are initially being offered a way to make encrypted mobile phone calls no need to buy costly satellite-only cell phones.

Having sat phone you are secure knowing that you have a reliable and accessible handset that you can use in case of urgency

The new capability comes from VoIP call encryption provider Cellcrypt, which has upgraded its regular client software for Blackberry and Nokia S60 smartphones so they can make calls via Immarsat's range of BGAN (Broadband Global Area Network) devices.

Called Cellcrypt Mobile for Satellite, the connection to the BGAN is made using Wi-Fi, but however the service is said to require no exact setup for the Immarsat service. As with Cellcrypt's GSM encryption, the only other requirement for a safe call is to obtain the same software running on the receiving handset, though unencrypted calls can be made to any receiver.

Based on Cellcrypt's CEO, Simon Bransfield-Garth, the present market for fully secure satellite calls has yet been tiny, mostly consumers in the armed forces and government.

The company had to consider that satellite calls were subject to high latency as coverages moved to and from satellites, which could reach several seconds in some instances. Bandwidth was also restricted. The company estimates performance as around one second delay making use of a single handset and BGAN, or 2 seconds for calling a second mobile phone also connected to a satellite terminal.

The major advantage for the sorts of dedicated business users who would be attracted to the service was just the accessibility of being able to make satellite calls with the help of the same handset they used to make any other call, stated by Bransfield-Garth.

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