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Author Topic: Alternative to Gentner phone interface  (Read 8970 times)

Luke Geis

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Re: Alternative to Gentner phone interface
« Reply #10 on: July 15, 2015, 11:52:57 pm »

Many phone systems these days that are used in conferences have 1/8' outs, not to mention many programs and or converter boxes that will VoIP signal into the analog world. The Telos boxes are definitely one of the best these days as it does simplify the engagement, but I have had a several low budget conferences where the attendee's are spread across the globe and didn't have to use a single box to make it work. Citrix has a couple of programs aimed at this type of setup as well as a couple other companies. You can get temporary licenses too. Skype is an alternative and quality is less than desirable, but it does work. I think it should be more on what your client is willing to pay and the level of quality they wish to acquire. I would look more into renting the units than buying though.

Imagine a VoIP to analog converter which can be obtained cheaply for under $100 a basic telephone set and a universal telephony adapter ( UTA ) that can also be had cheaply. For about $200 you can have a perfectly fine VoIP converter.
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David Buckley

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Re: Alternative to Gentner phone interface
« Reply #11 on: July 17, 2015, 09:09:55 am »

Imagine a VoIP to analog converter which can be obtained cheaply for under $100 a basic telephone set and a universal telephony adapter ( UTA ) that can also be had cheaply. For about $200 you can have a perfectly fine VoIP converter.
Interesting approach.

What I fail to understand is why there isn't a reasonably priced PC (or Mac!) solution for this.  Or maybe there is and it has passed me by.  Anyway, as I noted above VoIP is natively four wire, so all that is needed is bit of client VoIP software that connects to a soundcard and manages the call setup and has decent codecs for HD voice.  Of course, that soundcard could be a Dante virtual soundcard, and thus one has a complete software VoIP to Dante audio with just one ethernet cable.

That would be quite handy as one could have a bunch of VoIP connections on one PC with a truckload of mix-minus mixes without needing the heap of cables...
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Hayden J. Nebus

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Re: Alternative to Gentner phone interface
« Reply #12 on: July 17, 2015, 09:54:42 am »

A few months ago I had to do this in a pinch on a site with no POTS. We bought a magic jack at the corner drugstore and used it with a USB interface. We needed send only, which worked well.
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Scott Holtzman

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Re: Alternative to Gentner phone interface
« Reply #13 on: July 17, 2015, 06:42:00 pm »

Interesting approach.

What I fail to understand is why there isn't a reasonably priced PC (or Mac!) solution for this.  Or maybe there is and it has passed me by.  Anyway, as I noted above VoIP is natively four wire, so all that is needed is bit of client VoIP software that connects to a soundcard and manages the call setup and has decent codecs for HD voice.  Of course, that soundcard could be a Dante virtual soundcard, and thus one has a complete software VoIP to Dante audio with just one ethernet cable.

That would be quite handy as one could have a bunch of VoIP connections on one PC with a truckload of mix-minus mixes without needing the heap of cables...

The VoIP idea is genius.  All you have to do is get a softphone such as 3CX and en external device to interface the phone line to a SIP connection (these are called ATA's  Analog Terminal Adapter).  With a little programming the softphone would ring,you would be bridged to the POTS line.  The phone network only uses 8Khz PCM so you don't need an HD CODEC Then use your favorite USB audio device as the ear and mouth outputs from the softphone.

Brilliant, simply brilliant.

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David Buckley

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Re: Alternative to Gentner phone interface
« Reply #14 on: July 18, 2015, 08:22:57 pm »

The VoIP idea is genius.  All you have to do is get a softphone such as 3CX and en external device to interface the phone line to a SIP connection (these are called ATA's  Analog Terminal Adapter).  With a little programming the softphone would ring,you would be bridged to the POTS line.  The phone network only uses 8Khz PCM

Fx: Sound effect of me slapping my head

But............ the whole point of this thread is using VoIP is deliver better audio than the bandwidth limited POTS line delivers :)  There are ways of getting quality audio over the interwebs, but they generally suffer from terrible latency, as they use buffering to ensure an interruption-free audio path.  Getting decent audio bandwidth with low latency without chewing up huge amounts of internet bandwidth is much harder, it's the classic case of pick any two.  HD voice using G.722 codecs appears to allow one to have all three...
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Keith Broughton

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Re: Alternative to Gentner phone interface
« Reply #15 on: July 19, 2015, 08:57:32 am »

The JK stuff is pretty good, but as far as I am concerned the only telephone interface I want to see is a Telos One. I have never like the Gentners due to their lack of easy to use level controls and level monitoring. There are more modern interfaces, but I really like the UI of the Telos. I have 4 of them on the job I'm headed out to this afternoon.

Mac
I use a JK product that was about $150. Cost effective and works just fine.
However, I am interested in VOiP options.
« Last Edit: July 19, 2015, 09:01:02 am by Keith Broughton »
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John J Saunders

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Alternative to Gentner phone interface
« Reply #16 on: July 19, 2015, 09:23:56 am »

If you are looking for point to point over the Internet and can have hardware at both sides I would look into barix. They have audio encoders and decoders and can encode pcm, MP3, and I think the 711 and 722 codecs. I have tested the latency round trip when I was looking for a comms solution. It has been a year but I think it was 180ms round trip over stable internet connections. One thing about it is that to get low latency 1 device has to have a public IP address. 

Of course none of this helps if you don't or can't have access to the other side of your connection and need something easy that anyone can setup.

If I'm not mistaken getner/clear one and polycom have business ip conferencing solutions.
« Last Edit: July 19, 2015, 09:33:10 am by John J Saunders »
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Scott Holtzman

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Re: Alternative to Gentner phone interface
« Reply #17 on: July 20, 2015, 04:50:17 am »

I use a JK product that was about $150. Cost effective and works just fine.
However, I am interested in VOiP options.

What do you want to do with the VoIP connection?

Do you want to terminate PSTN call into a conference bridge the uses a VoIP interface to your provider?

Do you want to put devices at the remote conference locations that utilize a VoIP protocol to backhaul the audio and signalling?

Or something else???

I am not clear on your goal.

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Keith Broughton

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Re: Alternative to Gentner phone interface
« Reply #18 on: July 20, 2015, 09:28:48 am »

What do you want to do with the VoIP connection?

Do you want to terminate PSTN call into a conference bridge the uses a VoIP interface to your provider?

Do you want to put devices at the remote conference locations that utilize a VoIP protocol to backhaul the audio and signalling?

Or something else???

I am not clear on your goal.
I didn't say I had a goal....just curious.
I don't have a particular need, at this time, but I find the options people are offering are quite interesting.
Mostly, I am able to get a POTS line but sometimes we need to send outbound audio to a conference bridge and only have access to in house "digital" (can't think of the correct word) phone systems.
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David Buckley

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Re: Alternative to Gentner phone interface
« Reply #19 on: July 20, 2015, 07:19:19 pm »

... but sometimes we need to send outbound audio to a conference bridge and only have access to in house "digital" (can't think of the correct word) phone systems.

JK Audio to the rescue!!

Disclaimer: I haven't actually tried this particular box, but have used something functionally similar to connect a modem to a digital phone system for a strange job many years ago.  Of course, with these handset connected interfaces, one is reliant on the hybrid in the phone system, which may or may not be as good as the hybrid in a Telos or whatever.

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