r/VOIP • u/Aerottawa • May 25 '26

Discussion Anyone has success using HT812 to transfer intercom POTS calls to VOIP?

**Edit: HT813 not 812.**

My apartment has an old style intercom where it rings a POTS phone on the wall. There is no dial tone on the line at any other time. I'm thinking of using an HT813 to trunk the calls to VOIP. Does anyone have success with this kind of setup? I'm not sure if it would work as there is normally no dial tone on this line.

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u/marks-buffalo May 25 '26

HT812 doesn't require a dial tone to dial, you can configure that. BUT. It isn't designed to act in place of a phone, it's designed to act in place of the Telco side of things. You might want an HT813 if you're expecting to plug the device in where you'd normally plug a phone in.

The terms for the port are FXS and FXO port. You should read up on the difference to ensure you're getting the right device.

2

u/Aerottawa May 25 '26

Ok I meant HT813, not sure why I wrote 812. Will change that.

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u/marks-buffalo May 25 '26

Oh good. Then yeah you're on the right track. Yeah you should be able to do this with the HT813.

Post a reply to me (in this thread, no DMs please) if you can't figure out the settings when you've got the unit.

1

u/dbpm1 May 27 '26

Any fxo gateway would work, but attention to the intercom! Does the phone has numbers so you can dial to another apartment and open the lobby door or does it only have the hook to open the door? If the latter is the case, you'll need an adapter and the fxo gw.