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A Secure Call is a voice connection which can't be wiretapped and it runs over Voice Over IP (VoIP) communication protocol.

End to Site security model

Secure call is encrypted from client up to server.
The end to site security model provides a strong security level and can be used among two or more

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equipped devices and/or among SNOM 300 landline devices or also for connecting other  PBX, secure or not. If PBX is not secure, we face a crypto-to-clear scenario, where the call is secured between

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and

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, but is not secured between 

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and PBX.
Given that in this security model the server can decrypt secure calls content, it is possible to provides advanced telephony features such as:

• 3-way calls
• call transfer
• conference rooms

End to End security model

Secure call is encrypted from client up to the other client. Despite server relays encrypted traffic, it does not knows the encryption keys, so it cannot decrypt the call content.
The end to end security model provides the highest security level but can be used only between two

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equipped devices.
This security model does cannot be used to integrate enterprise PBXs.

In this security model the server cannot decrypt secure call content, so advanced features are not available. 

Multilevel security model

This is a mix of the other security model. Each call made by a PrivateWave client produces encrypted traffic based on the recipient of the secure call:

• if the call recipient is another PrivateWave client, the call is made using the ZRTP protocol for key exchange
• if the recipient of the call is not a PrivateWave client, the call is made using the SDES protocol

This security model can be used to integrate enterprise PBXs.

It is also possible to provides advanced telephony features such as:

• 3-way calls
• call transfer
• conference rooms
  

using SDES protocol.

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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 

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clients and can be connected to a standard PBX via SIP Trunks if configured accordingly.

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is the VoIP client for Secure Calls connections. It has to be used along with

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.

Conference Rooms

The Conference Room is the kind of call that more persons can partecipate. The conference calls are usually defined as "rooms", whose access can be limited by time settings or pass code. 

Warning
This feature is not available for account end-to-end accounts.

Conference Calls

Conference Call, as its name implies, is a call involving at least three users. It differs from Conference Room by the fact that Conference Call is one Secure Call at which third parties got invited. So it's one sort of dynamic conference room. All users invited are thus added to conversation in progress by either caller or callee.

Warning
This feature is not available for account end-to-end accounts.

Jitter 

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. 

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