SIP Trunking
SIP Trunking carries your business phone calls over the internet instead of legacy PRI or TDM lines ... lower cost per channel, channels you can add or drop on demand, and built-in failover. It is the standard upgrade path off a PRI.
How SIP trunking works
Your phone system (PBX) connects to the carrier over your internet or data circuit instead of a physical PRI. Calls become data, channels become software, and you can reroute everything to another location or cell phones in seconds if a site goes dark.
Typical SIP pricing
Real pricing depends on your address, the carriers there, and your term. The fastest way to a real number is to let providers quote you.
Is it right for you?When SIP fits
✓ Great fit
Any business on a PBX still paying for PRIs, multi-location voice, seasonal call volume, and anyone who wants calls to survive a site outage by rerouting instantly.
● Consider instead
If you would rather not run a PBX at all, a fully hosted phone system (UCaaS / Hosted PBX) bundles the handsets and features ... SIP trunks keep your existing PBX.
SIP vs. the alternatives
Lower cost per channel, software scaling, and failover ... PRI is fixed and physical.
SIP keeps your PBX; hosted replaces it entirely.
Far more scalable and resilient than POTS lines.
How to compare SIP providers
- ✓Channels vs. concurrent calls. Know how many simultaneous calls you actually need.
- ✓E911. Confirm proper emergency-call handling per location.
- ✓Failover / DR. Automatic rerouting if a site goes down.
- ✓Number porting. They should port your existing numbers cleanly.
SIP trunking questions
What is SIP trunking?
Voice service that connects your phone system to the carrier over the internet, replacing PRI/TDM lines.
SIP trunking vs. PRI?
SIP is cheaper per channel, scales in software, and adds failover ... the modern PRI replacement.
How much does it cost?
Often $15 to $50 per channel, so roughly $100 to $1,000+ per month by size.
Can I keep my phone numbers?
Yes ... existing numbers port over.
SIP Trunking, city by city
Compare providers in metros nationwide:
Plus more metros in the full directory below.