Session Initiation Protocol (SIP)

Session Initiation Protocol or SIP for short is used for controlling voice and video calls over Internet Protocol (IP) networks. As a signaling communications protocol, a SIP identifies messages that are sent between peers – these peers govern establishment, terminations and various other aspects of a call broadcast.

In addition to a voice broadcast, a SIP can be utilized in video conferencing, online stream distribution, instant messaging, fax over IP, online video games, and much more. Since its inception in 1996, SIP (Session Initiation Protocol) has been developed and standardized by the Internet Engineering Task Force (IETF).

SIP works in conjunction with the following protocols:

Session Description Protocol (SDP) – Media ID and negotiation
Real-time Transport Protocol (RTP) – Transmissions of voice and video media streams
Transport Layer Security (TLS) – Encryption to secure SIP messages

Call Forwarding
Caller ID
Cellular Telecommunications and Internet Association (CTIA)
CNAM
Common Alerting Protocol (CAP)
Common Short Code Administration (CSCA)
Connected Call Length
Do Not Call (DNC)
DTMF
FreePBX
Interactive Voice Response (IVR)
Long Code
Multimedia Messaging Service (MMS)
Opt-In
Opt-Out
Phone RSVP System
Phone Script
Phone-In System
Plain Old Telephone Service (POTS)
Predictive Dialer
Private Branch Exchange (PBX)
Push Notification
Push-To-Repeat
Push-To-Talk
SaaS
Session Initiation Protocol (SIP)
Short Message Service (SMS)
Simple Mail Transfer Protocol (SMTP)
SMS Gateway
STIR/SHAKEN
Telephone Chain
Telephone Polling
Text Message Forwarding
Text Message Marketing
Text-To-Speech (TTS)
Vanity Phone Number
Voice Over Internet Protocol (VoIP)

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