SIP Trunking is a carrier service that routes enterprise voice to and from the public telephone network using Session Initiation Protocol over IP. If you’re asking what is SIP Trunking, it’s the modern replacement for PRI lines—letting you keep numbers, add capacity on demand, and run calling over internet or dedicated circuits via a certified session border controller (SBC).
We often see organizations adopt SIP trunks to consolidate carriers, lower per-minute costs, and enable cloud UC or contact centers at global scale. Because it’s software-driven, you can port numbers, localize caller ID, and design resilient call flows without new copper circuits.
Key advantages include:
- Flexibility: Scale channels elastically and burst for peaks.
- Resilience: Geo-redundant trunks and SBC failover protect uptime.
- Control: Advanced routing, E911, recording, and compliance options.
- Global reach: Local DIDs and toll-free across many countries.
Our take? SIP Trunking turns telephony into a policy-driven service—faster to deploy, easier to scale, and cheaper to run than legacy trunks.
Planning a move off PRI or optimizing carrier costs? Start with our SIP Trunking Guide for architecture, SBC, and E911 patterns, then read Planning For a Successful SIP Trunking Implementation to translate best practices into a smooth, low-risk rollout.
