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Grandstream HT813 not answering on FXO. (alien.top)

submitted 2 years ago by External_Gain2380@alien.top to c/voip@netheads.online

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I bought a Grandstream HT813 to integrate my apartment intercom so it rings my VoIP phones internally and cell phone externally. The complex I live in has a different ring pattern for calls from the panel downstairs. It's basically 2 short bursts of ring.
I have a telephone line tester and it is confirmed to be working properly but this uses the regular c=2000/4000; ring. I've tried playing with these numbers. Such as c=1000/250-1000/4000; It still can't seem to pickup on it. It's similar to the UK ring but longer ring times.

I recorded an old phone ringing to this pattern when called for which I have the file if anyone is interested. Perhaps someone can give me an idea what the correct numbers should be.

The other thing is, why does it matter what the ring candace is. How about just pickup the phone anyway? or have an option for "ring candace learn" if it is required?
I mean my brother printer/fax can pick this up on the 2 long setting or simply answer it on fax only mode.

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[–] artfuldodger25@alien.top 1 points 2 years ago (1 children)

Been a while since I played with my HT813 but I think the ring patterns are more for the FXS port ("how the phone should ring") than the FXO port ("the pattern incoming calls ring witih")

I did something similar to you, getting a hardwired condo enterphone to ring through to my PBX then through to my cell. I think it was a call forwarding setting on the FXO port and the call went through straight away. There's maybe a setting for caller ID on the FXO port too - this is usually sent between the first and second bursts of ringing, so you might want to turn that off to get a quicker notification of an inbound call.

Maybe post a screenshot of all the FXO settings?

[–] External_Gain2380@alien.top 1 points 2 years ago (1 children)

I had more time today and I believe I determined the issue.

I have an Xlink BTTN which I had in storage. I used it for a number of years till I decided to go full digital.

I basically called into the HT813 and it answered on every ring pattern regardless of the C=xxxx stuff. I have since restored that to the c=2000/4000;

I decided to connect it from the RJ11 coming from the panel to the RJ11 of the BTTN and then the output of the BTTN's RJ11 to the FXO of the HT813. Went downstairs, dialed my apartment and it picked up after the first ring pattern, I heard dialing and 2 seconds later my cellphone rang.

That's when it dawned on me. The Xlink BTTN might be reproducing that ring and the gateway sees proper signals and answers it.

Where as the panel downstairs may not be producing enough voltage. Then again technically speaking makes sense. I am on the opposite end of the building away from that panel. With the wire distance. It might have alot of loss that the HT813 is not seeing sufficient ringing.

I'm now in the market for a REN or Ring Voltage booster or something that can provide a clean signal the HT813 would recognize. I think it would solve my issue.

[–] artfuldodger25@alien.top 1 points 2 years ago (1 children)

Hmm.. lower voltage isn't the worst theory out there.. but at the same time I'd be surprised.. those ATA devices have always had super wide tolerances on the FXO port. What you could do maybe is spin up a syslog server on your PC and get the ATA to log to it for a bit. Go buzz in from downstairs and see if it spits out data on the ringing.

Your theory on the Xlink re-generating the ring tone? Yeah, could be - I'm not familiar with those devices but if you're going wall outlet --> xlink --> FXO port on the ATA and it's working? welllll... kind of suggests that's what's going on.. but I'm honestly surprised that wall --> FXO doesn't work the same way.

With it connected wall --> FXO, when you buzz in from downstairs, does it just ring and ring and ring? Or do you hear something else?

[–] External_Gain2380@alien.top 1 points 2 years ago

With the Xlink BTTN being put into the middle of this, I go dial downstairs, it picks up on the first ring. And I have picked random times to test it. Zero issues

With the FXO connected directly to the wall and downstairs when I dial. It will ring and ring and ring and nothing ever picks up. It eventually times out and just cancells.

I have an older 2500 phone with bell Ringers. Seems to ring strong but that's only listening to the audio from my phone as I hit record and go dial downstairs.

I'll do a syslog tomorrow.