Frequently asked questions

SIP trunking delivers phone service over your internet connection instead of traditional copper lines. Your PBX connects to Resonance Telcom using the SIP protocol, and we connect your calls to the public phone network.

A channel is one simultaneous call path. Ten channels let ten calls happen at the same time, in any mix of inbound and outbound.

Count the most calls your business has going at once during its busiest hour, then add a little headroom. If you are unsure, send us a recent phone bill and we will help you size it.

If your PBX or gateway supports SIP, almost certainly. We publish setup guides for 3CX, FreePBX, Asterisk, FreeSWITCH, Grandstream, Cisco, Allworx and Switchvox.

Many legacy PBX and key systems connect through a SIP gateway or analog telephone adapter. Tell us what you have and we will suggest the simplest option.

No. Your phones talk to your PBX, and your PBX talks to us. Nothing changes at the desk.

A self-service portal, real-time call records, local and toll-free numbers, and support from engineers who understand SIP.

Once your account is active, setup is a short checklist: enter our settings in your PBX, assign your numbers and place test calls. Our team can walk you through it.

Plan on roughly 90 kbps in each direction per simultaneous call using the G.711 codec, on a stable connection with low jitter. A business-grade connection with QoS on your router gives the best results.

Yes. You can create multiple trunks under one account, one per site or phone system, and manage them all from the same portal.

Your numbers live in the network, not in your building, so they can be pointed at another trunk or destination from the portal while you fix the problem.

With a solid internet connection and sensible configuration, yes. Many businesses add a second internet connection so calls keep flowing if one provider has an outage.

Yes. Because numbers are not tied to physical lines, you can route calls to a different site or system when one location is unavailable.

Call or email our support team. You will reach people who understand SIP and PBX configuration.

Yes. See our partner program for reseller, agent, MSP and technology partnerships.

Yes. The portal shows real-time call detail records you can search by date, number or trunk, and export for your own reporting.

Yes. Every call on your trunks appears, with direction, duration, and the numbers involved.

Yes. Order local numbers in the area codes you need, subject to availability, and assign them to any trunk.

Yes. Toll-free numbers can be added to any account alongside local numbers.

You pay a flat monthly rate per channel and per phone number. See our pricing page for current rates.