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A Secure Call is a voice connection which can't be wiretapped. It runs on the Voice Over IP (VoIP) communication protocol and can be used operate in two classification security models:
- End to end
- End to site
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PrivateServer
PrivateServer is the PBX committed to perform Secure Calls both end to end and end to site. It differs from a standard PBX for exposing just the Secure Call service to VoIP PrivateGSM clients and can be connected to a standard PBX via SIP Trunks if configured accordingly.
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PrivateGSM is the VoIP client for Secure Calls connections. It has to be used along with PrivateServer and is deployed in two different models to perform two different secure security models:
- PrivateGSM Professional: used for end to end communications
- PrivateGSM Enterprise: used for end to site communications
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The conference call is a call in which more than one person can partecipate. The conference calls are usually defined as "rooms" which , whose access can be limted limited by time settings or pass code. In PrivateServer the conference calls can be provided on a Secure Call base if using the PrivateGSM Enterprise Edition only.
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The Three-Way call, as the name implies, is a call among three partecipants. The third user is added to a precedent running conversation by one of the two talkersparteipants.
Call transfer
Call transfer is a typical PBX performance which is implemented in PrivateServer as well, but only if the users are running a PrivateGSM Enterprise Edition. One of the talkers partecipant can hold on his/hers peer and perform a new call to the number to which trasfer the call. If the desired number picks up the call, then the transferrer can close the communication and let his/hers peer talk with the trasferred number.
Jitter
Jitter is the undesired deviation from true periodicity of an assumed periodic signal in electronics and telecommunications. The Jitter we talk about is observed in the frequency of successive voice network packets. Jitter is a significant, and usually undesired, factor in the design of almost all communications links.
Jitter period is the interval between two times of maximum effect (or minimum effect) of a signal characteristic that varies regularly with time.
Jitter frequency, the more commonly quoted figure, is its inverse.In VoIP systems audio signal is split into multiple packets, which are sent over network. Due to network equipment behavior, packets flow is never regular and constant. Especially on mobile/radio networks packets are delivered in bursts, leading to irregular and variable latency. Jitter is the variation in latency as measured in the variability over time of the packet latency across a network.
Automatic Activation
The Automatic Activation is the way of create new users automatically without any need they interact with anybody. As from user's side the procedure is that he/she gets first an invite SMS useful to download the application PrivateGSM and then a configuration SMS which provides automatic configuration of the client itself. All the user has to do is follow the links into both the SMSes and it goes automatically on line.
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The Presence is how we call the user's status, also know known as the user's reachability. By checking an user's Presence it 's is possible to know if a he/she is on line and can receive a secure call before trying to.
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