What is SIP trunking?
A way to connect a business phone system to the phone network over the internet.
SIP trunking, explained
SIP (Session Initiation Protocol) carries voice calls over IP. A SIP trunk links your phone system or voice AI platform to a telecom carrier, so it can make and receive normal phone calls.
Voice AI platforms often use SIP to connect to a telephony provider's numbers.
SIP trunks are sized by the number of simultaneous calls they carry, so capacity planning matters before large outbound campaigns.
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Related terms
- PSTN (public switched telephone network)The worldwide network of ordinary phone lines and mobile networks that phone calls travel over.
- Virtual phone numberA phone number that isn't tied to a physical line and can route calls to software, staff or both.
- Concurrent callsThe number of calls a system can handle at the same time.
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