Telephony
VoIPVoIP
Also called: voice over IP · internet telephony
VoIP (Voice over Internet Protocol) is technology for carrying phone calls over the internet rather than the traditional analog phone network. It's the transport layer that connects AI voice agents to the phone system.
VoIP makes programmable telephony possible — placing and receiving calls via software and APIs, provisioning numbers in many countries, and scaling call volume elastically. SIP is the signaling protocol most VoIP uses.
Related terms
SIP trunkingA method of connecting a phone system to the telephone network over the internet using the SIP protocol — how voice platforms carry calls at scale.DTMFThe tones a phone keypad makes when you press a key. DTMF is how callers enter numbers (like an account ID) that a voice agent can capture.Call routingDirecting an incoming call to the right destination — person, team, or queue — based on rules, caller input, or what the AI agent understands.
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