wrong sub. I'm sure there are some professional solutions out there already. Don't be cheap if you are running a business.
Self-Hosted Main
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I haven’t seen any business VOIP plans that are unlimited outbound, and no matter who you use you’re paying for calls to/from the PSTN. I use CallCentric - they have plans for 120/500/1000/2500 minutes to US/Canada. You need to pay for the line and e911 service, and yes they give you instructions on how to connect to many devices.
I think your total would be $40 or so per month for the line (unlimited inbound) and 2500 outbound minutes.
I ran FreeSwitch with a signalwire sip trunk. I don't think there's much cheaper than that. Pay as you go, less than a penny per minute. Only monthly fee is holding onto the numbers you want, each number is like $0.50 per month.
But installing and maintaining it is a challenge for even good sysadmins.
I'd go with 3CX or a similar all in one provider if I had to make the call.
Also, use a good USB headset and a soft phone on your computer instead of that old cisco handset. Get away from handsets ASAP. They are the most expensive thing, vendor support dries up fast, and the audio codecs go stale. Firmware vulnerabilities emerge, compliance requires you to update them, so every 5 years, new handsets for everyone. It's a joke. USB headset or a good USB speaker phone will work with any system, until they physically break. 3cx has soft phone clients so handset isn't needed at all.
$48 is expensive? lol
Maybe not for you.
Sipharmony.com is heavily competing against Voipms! We use them for all of our pharmacies. Check them out!