Session Initiation Protocol Facts
                     
• Session Initiation Protocol or SIP is a signalling protocol.
• SIP is used for initiating, modifying, maintaining and terminating 
real-time sessions that involve voice, video, messaging and other 
communications applications. 
• The main function of the SIP is to establish a session and 
afterwards end it when necessary.
• Session Initial Protocol does not have any fixed media type. 
• SIP supports the major authentication and encryptions. 
• SIP does not depend on the lower-layer transport protocol. This, in 
turn, enables it to associate with the new transport protocol.
• User Agent: It initiates, modifies or terminates a session through 
devices. 
• Proxy Server: It takes a request from a user agent and forward it to 
another user.
• Registrar Server: It accepts registration requests from user agents.
• Redirect Server: This server generates 3xx redirection responses.
• Gateway: Its function is to interconnect a SIP network to other 
networks.
• VoIP or voice over internet protocol is one of the best forms of 
telecommunications.
• VoIP is a communication protocol which enables one to send voice 
over the internet.
• SIP is the signalling protocol that establishes, modifies and 
terminates multimedia sessions like VoIP Calls.
• Both SIP and VoIP create the foundation of IP technology.
• VoIP is a combination of other technologies and is used within the 
present day telecommunication network. On the other hand, SIP is 
used within VoIP.
• While VoIP majorly focuses on voice, SIP deals in all forms of media 
including voice.
• SIP is able to handle large amounts of data and traffic, while on the 
other hand, VoIP hosts traffic from one single network. 
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