SIP trunking is the right answer when you already have a phone system worth keeping. Rather than replacing the PBX, you replace what connects it to the outside world: the copper trunks or PRI circuits come out, and SIP channels over your fiber connection go in. The handsets, the dial plan, and the way your staff work do not change.
For Fresno organizations still paying for PRI service, this is usually the single clearest cost reduction available in telecom, and the operational improvement is real too — channels scale in software rather than in 23-channel increments, and calls ride a connection you already own.
The trunk side and the billing. Your PBX needs a SIP-capable interface — either natively or through a session border controller — and your circuit needs enough headroom and correct prioritisation for voice. Dial plans, extensions, voicemail, and call flows carry over. Most cutovers are scheduled overnight with the old trunks left in place until the new ones are proven.
Porting existing numbers is the part organizations worry about, and rightly — a mishandled port takes a main line down. It is a paperwork and scheduling exercise before it is a technical one: current bills, a letter of authorisation, an accurate service address, and a port date coordinated with the losing carrier. We keep the old service live until the new one carries traffic correctly.
Running SIP trunks over the same fiber circuit that carries your data means one provider is accountable for call quality end to end. When voice rides someone else's internet connection, diagnosing jitter becomes a negotiation between vendors. When it rides ours, it does not.
Full service detail lives on the SIP Trunking page, and the wider market context is on the Fresno location page.
If the PBX is SIP-capable, directly. If it is older, a session border controller sits between it and the trunks. We confirm compatibility before the order rather than after, because discovering it at cutover is the expensive way to find out.
Yes. Numbers port to the new trunks. Porting is a scheduled process coordinated with your current carrier, and we keep existing service live until the ported numbers are confirmed working.
Base it on concurrent calls at your busiest hour, not on headcount — most organizations need far fewer than they assume. Unlike PRI, channels can be adjusted without adding physical circuits, so there is no penalty for sizing accurately.
SIP trunking keeps your phone system and replaces its connection to the outside world. Hosted PBX replaces the phone system itself with a cloud platform. If your PBX is serving you well, trunking is the smaller and cheaper change; if it is end-of-life, hosted is usually the better destination.
Send us the address and a bandwidth target. A California-based engineer confirms what can be delivered there, what it involves, and how long it takes.
Send the Fresno address and what the connection needs to carry. An engineer confirms whether it can be served, what the build involves, and how long it takes.
Service availability depends on location, network proximity, capacity, and engineering review. Share an address and we will confirm what can be delivered there.