What is SIP Trunking?
SIP trunking is a method of delivering voice and other communications over the internet using Session Initiation Protocol (SIP). Instead of traditional phone lines, SIP trunks connect your phone system to the public telephone network via internet connectivity, typically reducing costs and increasing flexibility.
How SIP Trunking Works
SIP trunks replace traditional PSTN (Public Switched Telephone Network) connections:
- Voice over IP — Calls travel as data packets over internet
- Virtual channels — No physical phone lines required
- Elastic capacity — Add or remove channels as needed
- PSTN gateway — SIP provider bridges to traditional phone network
Benefits of SIP Trunking
- Cost savings — Lower per-minute rates than traditional lines
- Scalability — Add capacity instantly without physical installation
- Geographic flexibility — Use local numbers from anywhere
- Disaster recovery — Reroute calls if primary location is down
- Unified communications — Voice, video, messaging on same infrastructure
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