All communications between users are encrypted using the peer audited NaCl crypto library, and this encryption cannot be turned off. Tox is a core library that connects users using a proprietary protocol. A registrar node is a special type of end node that accepts REGISTER requests from a UA, and places the information received in a location service to link an IP address to the SIP URI of the agent. Each resource in an SIP network has a uniform resource identifier (URI) that can be used to address that resource. In addition, intermediate nodes exist called proxy servers which route information through the network from the UAC to the UAS and vice versa. These roles are adopted for the duration of the SIP transaction. (UAS), which receives the requests and returns a SIP response.
UA can act as a User Agent Client (UAC), which sends SIP requests, or a User Agent Server Įach end node involved in an SIP communications network is called an SIP user agent. These transactions are used for setting up and taking down voice and video calls. One SIP transaction consists of a request sent by the client to the server, which calls a function on the server and a response back to the client. For encryption, Jitsi supports use of Transport-Layer Security (TLS) in conjunction with SIP. In addition, SIP uses other application protocols including Real-time Transport Protocol (RTP) for the transmission of voice and video data. Underlying transport protocol, meaning that SIP network communicationsĬan occur over TCP, UDP, and SCTP. For our purposes, we will make use of the SIP communications protocol for testing and comparison with the Tox protocol.
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