General Chat Thread, SIP to analogue gateway? in General; I don't know if a product exists but what I'm after is a device that will allow me to use ...
24th July 2009, 09:26 PM #1
SIP to analogue gateway?
I don't know if a product exists but what I'm after is a device that will allow me to use a SIP handset on an analogue phone line.
Basically, I want to be able to be able to receive calls to my landline via my smartphone and (to a lesser extent) make calls via the landline. Ideally, the device will also act as a DECT base station.
I don't want a lot do I?
Of course, I suppose I could build an Asterisk box but it's going to be overkill!
IDG Tech News
24th July 2009, 10:05 PM #2
No idea whether this would work as intended, it has all the right hardware and is cheap but does not include its own sip server and it depends on the internal software of the device as to whether you can set it up in the way that you want.
One Port SIP/IAX VOIP Gateway (ATA) with PSTN lifeline x100p.eu
This should totally work with the right module in it though:
Compact Asterisk Appliance x100p.eu
it is a whole astrix server though.
This one is cheaper and looks much easier/better:
Voice Over IP
and this has all the features including DECT but again requires a SIP server to talk to:
Doro IP880 Dect IP Telephone
Last edited by SYNACK; 24th July 2009 at 10:09 PM.
27th July 2009, 10:41 PM #3
Linksys do one of these....
28th July 2009, 09:23 AM #4
@kylewilliamson: Linksys make a device that goes the 'other' way (i.e. analogue phone onto a VoIP network) but I don't think they make one to fulfill my needs.
BTW: The Linksys website sucks! I can't even find the ATA which I know that they produce!
28th July 2009, 09:37 AM #5
Ric, it sounds like you want a mini voip PBX. Take a look at voipon.co.uk, they have a huge selection of such wizardry.
However, the other thing you could do is use an old PC and stick a FXO card in it and run Asterisk on it. However, this would still be quite expensive, as you'd be wanting one with hardware echo cancellation and you'd be looking at about £360 for that. (or £180 without echo cancellation).
What are you trying to achieve?
28th July 2009, 09:44 AM #6
@localzuk: It is looking increasingly like a samll PBX would be just as easy to achieve.
What I was thinking about was OpenVox A400P11 - 1 FXO 1 FXS - I don't know how important echo cancellation is for such a simple solution.
I was then thinking of using Switchvox or Trixbox to save faffing (at least initially).
For the server, I was thinking of maybe going down the mini-ITX route (Atom-powered - possibly dual-core) - a single concurrent call shouldn't really need too much grunt.
This would then give me a bit of expansion potential, should I need it in the future.
28th July 2009, 09:52 AM #7
The problem with analogue to digital conversion is echo. BT set the lines at a certain gain level for your analogue line, and you then set the gain at your end to match (this is discovered by monitoring calls and viewing the volume of the calls via software on the PBX). If you do manage to match these so they work well, your system will still suffer from echo due to the nature of analogue lines. Software echo cancellation is ok, to a certain extent, but the number of complaints I get here because of echo far is quite high.
Originally Posted by Ric_
Hardware echo cancellation handles the situation a lot better, but comes at a price.
Also, another thing to mention is systems such as Trixbox (or any other 'ready made' Asterisk solution) still require faffing if you wish to get them exactly how you want them. Sure, you can fiddle with the basic settings but to get it hooked up to your analogue lines you still need to play on the terminal with zapata.conf and similar.
28th July 2009, 10:00 AM #8
So what your saying is to go for something like Digium TDM411E - 1 FXO 1 FXS PCI Card with Echo Cancellation VPMADT032 which then makes the solution prohibitvely expensive (it's almost £300 more!!!).
28th July 2009, 10:12 AM #9
Indeed I'm saying the best solution is one with hardware cancellation, it's all about gauging your needs.
Originally Posted by Ric_
It's more a case of 'what can you get away with?'.
(Although, that one has an FXS port too, which wouldn't be needed so you'd be wanting this instead: Digium TDM401E - 1 FXO PCI Card with Echo Cancellation VPMADT032)
However! There is another alternative. And that is to buy the TDM401B without echo cancellation, see how it is after fiddling with echo cancellation and if it is good enough, you're sorted, but if not, you can then buy the echo cancellation module separately. http://www.voipon.co.uk/digium-tdm40...ard-p-759.html and http://www.voipon.co.uk/digium-vpmad...ule-p-793.html
Last edited by localzuk; 28th July 2009 at 10:14 AM.
28th July 2009, 10:46 AM #10
@localzuk: I would need the FXS port as well because I would want to plug an analogue handset in too.
28th July 2009, 11:03 AM #11
28th July 2009, 11:27 AM #12
Looks ideal! 2 channel 128ms hardware echo cancellation too, which is pretty snazzy. (Digium does 64ms on their cards, which drops to 16ms when with larger numbers of channels).
Originally Posted by Ric_
28th July 2009, 06:19 PM #13
@Ric_ Did you miss my post above or was it just not helpful, this £90 device looks like it would forfill your needs and is much cheaper than the £300 device above.
Voice Over IP
28th July 2009, 06:23 PM #14
Looks like a basic system, with no echo cancellation (which, as I said, is key with analogue -> digital conversion).
Originally Posted by SYNACK
The Positron one is only £50 more so I'd still recommend that (looks like it is a full fledged Asterisk server).
28th July 2009, 09:27 PM #15
My understanding was that the Linksys Device had a FXO and a FXS port.... so you can do both
Linksys by Cisco SPA3102 VoIP Broadband Router with 1 FXS and 1 x FXO Port
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