What is SIP (Session Initiation Protocol)?
SIP (Session Initiation Protocol) is the signaling protocol used to set up, manage, and end voice and video calls over the internet in VoIP systems.
SIP (Session Initiation Protocol) Explained
SIP is the behind-the-scenes protocol that handles the setup and teardown of a VoIP call — locating the other party, negotiating which audio codec to use, ringing the destination, and ending the session when the call finishes. SIP only manages signaling; the actual voice audio travels separately as RTP (or encrypted SRTP) media packets. In traditional VoIP deployments, businesses buy SIP trunks from a carrier and connect them to a PBX or SIP-capable handsets and softphones. Modern cloud platforms abstract this away so teams never touch raw SIP configuration. Connectoo is a cloud-based VoIP platform where calling happens in the browser via WebRTC or in the mobile apps — the SIP-style signaling is handled entirely by Connectoo, so there are no SIP trunks to provision or handsets to configure, and no SIM-based calling anywhere. Numbers are available in 60+ countries. The key advantage of Connectoo over call-only providers such as Dialpad, OpenPhone, or Exotel is what happens after the call connects: every VoIP call is logged with native WhatsApp chats and SMS on one timeline in a built-in CRM, with auto follow-up workflows spanning all three channels. Connectoo serves teams of every size.
How Connectoo Implements SIP (Session Initiation Protocol)
Connectoo includes features directly related to sip (session initiation protocol). Explore these capabilities to see how the concept works in practice within a unified communication CRM.
Related Terms
These glossary terms are closely related to sip (session initiation protocol). Understanding them together gives you a more complete picture of communication CRM concepts.
VoIP
VoIP (Voice over Internet Protocol) is a technology that transmits voice calls over the internet instead of traditional phone lines, letting businesses place and receive calls from a browser or mobile app.
WebRTC
WebRTC (Web Real-Time Communication) is an open standard that lets web browsers make voice and video calls directly, without plugins or separate apps.
PBX
A PBX (Private Branch Exchange) is a private telephone system that routes calls within a business and connects internal users to external phone lines.
Codec
A codec is the software that compresses and decompresses voice audio for transmission over the internet in a VoIP call, balancing sound quality against bandwidth use.
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