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Telephony function: security / encryption

As in all areas of Stackfield, we place great emphasis on high security standards for telephony and screen sharing - from the selection to the implementation of the required resources. There is no need to download additional plug-ins, software or clients.

An overview of all security measures at Stackfield can be found at: https://www.stackfield.com/security.

Basic information: WebRTC

The transmission takes place on the basis of WebRTC (Web Real-Time Communication) standard, whereby all data streams must be encrypted. DTLS (Datagram Transport Layer Security) is used for the connection. The audio and video communication is additionally protected by SRTP (Secure Real-Time Transport Protocol). This means that the data is transport-encrypted during transmission via the internet.

The transport encryption is applied either during the transmission from client to client (peer-to-peer) or between client and the provider's server (= Stackfield).

Due to technical limitations of a browser, conventional communication tools only offer the indirect way via the own server for video calls.

Encryption of the telephony channels

Note: The following information applies to all rooms or chats, regardless of whether additional encryption has been activated or not. Thus, it makes no difference for the encryption of calls whether they are started via encrypted or unencrypted rooms.

Peer-to-peer transmitted + end-to-end encryption Over Stackfields server + transport encrypted
Audio direct calls (1:1) X
Video direct calls (1:1) X
Screen sharing (1:1) X
Audio group calls X
Video group calls X
Screensharing in groups X

In telephony, the transmission is mostly peer-to-peer (from terminal to terminal). Therefore, it does not run through Stackfield's servers. Here, the transmission is end-to-end encrypted. Audio calls (1:1), video calls (1:1), screen transmission (1:1) and group audio calls fall into this category.

The only exceptions are group video calls and group screen transfers. The reason for this is that for technical reasons they run via Stackfields Server, which has to take care of the distribution of the streams to the individual clients. However, the transmission is still transport encryption. Here some additional security standards apply:

  • There are no recordings or transcripts of any calls made or stored at Stackfield.
  • There is no tracking* of the conference participants, i.e. there is no history of who participated in a call or who connected/disconnected and when.
  • There won’t be any (hidden) analysis of metadata, users or communication.
  • The transfer of data to third parties is strictly prohibited.

*Notes: To enable the telephony function, the communication partners are informed of the public or private IP address of the devices. A history of some meta data of calls such as the status (connection connection attempt, connected) as well as when and by whom the conference was started/ended will be created.

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