Asterisk setup soho 4 CO 12 extensions


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> What is the best setup for ensuring an echo-free and trouble-free system?

I regularly build systems for clients based off of Asterisk.
If you want to be guaranteed of no echo whatsoever, then going the analog route seems the way to go for now unless you can afford the expense of a PRI line. My small office configurations usually utilize a Dell Optiplex GX270 as the actual phone system server and a T100P connected to an Adtran Channel Bank (TA750) with 1 FXO and 3 FXS Cards.
The PowerTouch 390 phones work really well, just make sure you get them though one of the distributors listed on Digium's site unless you have strong familiarity with ADSI programming. You can then run VoIP (I prefer Cisco) phones for offsite phones as necessary. Assuming you need a full 12 phones, the system usually runs about $5000 cost. The Avaya Partner system, a very popular system for small businesses, runs about the same price when you add in all the messaging and call routing modules but of course doesn't support VoIP.

Here is a complete list of Parts I use on a standard system:
  • Optiplex GX270
  • 1 600VA or higher UPS *VERY IMPORTANT* - You don't want bad power to kill the system
  • Digium T100P T1 Interface
  • Adtran TA750 /w 12 FXS - 3 Cards (Part # 4175002L3#AC)
  • Adtran TA750 QUAD FXO Card (Part # 1175407L2)
  • 5' Female to Female Amphenol Cable
  • 24 Port Telephone Patch Panel (2 conductor) - See
  • 1 24 Port Cat5e Patch Panel
  • Cat5e Cable and RJ45 Jacks (To run between the Desks and Cat5e Patch Panel)
  • Cat3 Cable and RJ11 ends (to patch between the Cat5e panel and the TelephonePanel)
  • Astra PowerTouch 390 Phones (or whatever phone client likes)

Some Additional Advice: Always run Cat5e from the desk to the Cat5e patch panel.
This way, if echo-cancellation ever becomes flawless in Asterisk, you have an easy migration path to VoIP phones. I generally do create Cat3 jumpers from the Cat5e patch panel to the Telephone Patch panel. For those of you who don't know, RJ11 connectors will fit and work in a RJ45 jack justfine. The same goes for the patch cord from the telephone to the Cat5e phone jack deskside.

Mind you, this is not the solution for those looking for the "cheap" way out.
If they want a flawless system that rivals and exceeds the reliability of what is in the market today, then they have to be willing to pay for it. I have about 10 systems in production like this at various clients. To date, I have not had any issues with any of them. This configuration is of course my opinion of the best configuration. As the saying goes, your mileage may vary.

Raymond McKay
RAYNET Technologies LLC

This page has been viewed 58734 times since Wed 29 of Sep, 2004 (19:43 UTC)

Created by: flavour, Last modification: Fri 13 of Apr, 2007 (16:28 UTC) by raymckay
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