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Self-hosted IP-phone network (feddit.nu)

submitted 6 months ago by [email protected] to c/selfhosted

24 comments fedilink hide all child comments

Just for fun, a few associations I'm part of want to set up our own IP-phone network, with our own phone numbers and such.

Is this possible?
How would one go about doing this?
Does it have to be it's own separate network or can it work via the internet without special setup beyond a public IP?

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[–] [email protected] 8 points 6 months ago (2 children)

Assuming you already have the IP phones, you need two things. A PBX server (for the VoIP stuff), and a SIP trunk with a block of external phone numbers.

Start with the PBX server software, there's several free/open-source implementations. Once you're comfortable with it and have internal calling good to go, then you can spend on the SIP trunk and number blocks.

[–] [email protected] 7 points 6 months ago* (last edited 6 months ago) (1 children)

Next step. Have your on site manager call in and tell the ISP to change your sip trunk settings to fuck everything and let no one know. 😎

[–] [email protected] 8 points 6 months ago

Step 3: unfuck the SIP settings, then email both HR and their supervisor to throw them under the bus. Also covers your ass for step 4.

Step 4: Route the manager's calls to a disconnected number. When they come knocking about their phone not working, tell them, "No, you should be able to dial out, unless someone changed the SIP trunk settings and didn't tell me."

[–] [email protected] 5 points 6 months ago (1 children)

What do you mean by "a block of external phone numbers?" We'd like to simply have our own internal numbers ideally, nothing to connect to the regular phone network.

[–] [email protected] 6 points 6 months ago

SIP providers usually sell numbers in contiguous series for businesses. For example, if your company buys a block of 50 numbers, the SIP provider then allocates XXX-5100 to XXX-5150.

But since you're keeping this strictly internal, you don't have to worry about that.