Interactions with standard GSM voice calls
As a general statement when you receive a standard voice call during a secure call (VoIP), you may:
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The above statement is not applicable to the iPhone platform. In case of Apple devices the secure call is immediately put in an "on hold" state until the GSM call is closed. The secure call can be retrieved afterwards if the other party is still waiting. |
behaviour changes during the ringing: - Android: The secure call audio is mixed with the ringings
- BlackBerry: The secure call is silenced as long as the phone rings
- iPhone: The secure call is immediately put in an "on hold" state until the GSM call is closed.
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As soon as the "on hold" state starts, the party "on hold" hears some music. This music is performed by and is called MoH (Music on Hold). |
Limits of protection provided by
can not protect your conversations against eavesdropping in your local physical environmental, for example:
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We suggest you to consult a security expert to protect yourself against these type of threats. |
Call quality on the move
It may take longer time to establish a connection or you may experience short interruptions in the audio when traveling by car or high speed train. This is because you are switching from one GSM network radio cell to another. Call quality depends on the local infrastructure of the mobile operator.
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No perceivable audio problems of a secure call were demonstrated in tests conducted driving on a highways at 150 km/h. |
Network type and call quality
Secure calls with
use VoIP technology that utilizes an Internet connection establish the audio flow via TCP/IP and UDP packets. The data packets containing the voice in encoded and encrypted form are routed on the network during a call.
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Use Wi-Fi when available. There are no additional costs and call quality will be definitely better. |
Data plan rates
secure calls use an Internet connection and data traffic will be charged by your mobile service provider. The exact costs depend on the contract with your mobile service provider. To receive secure calls,
has to keep an Internet connection open. You should therefore choose a rate that lets you
stay online as long as you need to receive and make secure calls (i.e.: 24/7, or business hours).
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When using abroad, be sure to have a data traffic plan that allows you to control your costs. |
Disadvantages of a limited traffic plan
Traffic plan limited in data
| When is running but no secure call is active, it still keeps alive a connection to the server. On average, uses a total of 2MB per month even when you do not call securely. A secure call uses data traffic between 100kbyte and 200kbyte per minute. So 1MB of Internet traffic is enough for a minimum of 5 to a maximum of 10 minutes of secure conversation. |
Traffic plan limited in time | As has to maintain a continuous connection to the server and these type of data plans are billed based on the connection time, these plans can create unaffordable costs and they are not recommended for . |
Differences between secure and standard calls
Delays in establishing a connection | To establish a connection with the called party, needs from 5 to 60 seconds based on the Internet connection quality of the caller and called parties. |
Audio delay | Unlike standard calls VoIP secure calls may be subject to an audio delays from 1/5 of a second to a maximum of two seconds. This depends on the underlying technology of the data transmission network. The better the connection, the smaller will be the audio delay. |
Different ringing tone | secure calls use different ringing tone than standard calls (not customizable). |
Battery life
| Internet connection may lower the battery life of the mobile device. Average battery consumption may increase from a minimum of 5% to a maximum of 35% based on the type of network used by the Internet connection. | Note |
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| A Wi-Fi network consumes more than a 3G network. A 3G network consumes more than a 2G network. |
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