asterisk and real telephones? - PBX Info :: Your Free PBX, PABX and Telephone Information Resource

rotary500 · 02-23-2005, 11:32 PM

I am wondering, if this is a PC based system, where can you get the voltage necessary to ring a telephone, or is a seperate power interface used? You can't get more than 5 volts from a PCI slot, with very little current and even the PC power supply couldn't drive any inductive loads like bells. I am very curious how this can work

jeboyes · 03-17-2005, 08:13 PM

I have just set up an asterisk system for a test. It is only software and only manages data packets from one address/extension to another.

To ring an analog phone, you have to purchase an ATA Adapter. The phone plugs into one side and the ethernet network into the other. The ATA Adapter does the D/A and A/D conversion as well as turning VoIP ring messages into the ring signal for the phone.

**rixride** · 04-28-2005, 10:39 AM

Jeboyes, is right,

You can find them on digiums website as well.
http://www.digium.com/index.php?menu=fxsmod

***jzawacki*** · 03-17-2006, 02:49 PM

Or, you can buy a Digium card with FXS ports on it. These can come with your standard RJ11 port to plug directly into with a phone cord (like your smaller PBXs do), or you can get bigger cards with a centronics connector that would punch down to your 110/66/bix blocks like your bigger PBXs do.

**rixride** · 03-17-2006, 02:54 PM

Quote:

Originally Posted by jzawacki

Or, you can buy a Digium card with FXS ports on it. These can come with your standard RJ11 port to plug directly into with a phone cord (like your smaller PBXs do), or you can get bigger cards with a centronics connector that would punch down to your 110/66/bix blocks like your bigger PBXs do.

How many connections does the "centronics" support? That is interesting.

***jzawacki*** · 03-17-2006, 03:27 PM

Up to 24 per card and you can mix/ FXO and FXS ports. They are a bit pricey at ~$1,885 for a 24FXS card with echo cancellation. But, about the right price if you compare it to a 16 port Meridian card.

VOIPBX · 07-01-2006, 01:36 AM

If you plan on using asterisk as your voip solution, something I strongly recommend, I would also recommend using IP phones. If you use Asterisk with analog phones you will either need an adapter like the PAP2 for each phone (or at least every 2 phones) you have in your network, or you will have to configure the Zaptel portion of Asterisk which incorporates a timing source and is much more confusing in my opinion than using a normal sip configuration with IP phones. The price of IP phones is more than worth it for the quality of service you will receive from using them. check out voipsupply.com for a look at some IP phone on the market

Iain
Imericom.com

***jzawacki*** · 07-07-2006, 08:08 PM

Don't forget all the benefits of VoIP phones like mute, hold, transfer, conference, etc.. which.. you can do on an analog phone using * codes.. but having a button do it for you is MUCH nicer.

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