[Asterisk-Users] Hardware for PBX with 4 incoming/outgoing lines and 20 phones

[spectro]

IMHO, If you plan to use analog phones the cheapest is to buy a bunch
of sipuras instead of TDM40B. (TDM40B = 4 FXS for $300, $75 each;
sipura SPA2000 = 2 FXS for $100, $50 each)

Order one TDM04B (4 FXO) and 1 Sipura 2000 for each 2 analog extensions. 

You can also mix it up, lets say drop two incoming lines and order a 2
FXS, 2 FXO TDM instead. Then subscribe to a VoIP provider like
Voicepulse Connect to dial-out through IAX.

Use the FXS on the TDM for fax machines and make these the only to
dial-out through the analog outgoing lines.

Of course, I would rather buy some IP phones instead of analog ones through FXS.

For your remote office, depending on the number of extensions, you can
either setup a small asterisk box or just use Sipuras 3000 and 2000
connected to your main office's asterisk server.


On Tue, 24 Aug 2004 17:11:36 -0600, Andrew Elchuk
<aelchuk at cronustech.com> wrote:
> Hi
> 
> I am interested in setting up an Asterisk PBX in my office with digium
> hardware, and I just have a few questions in regards to what I would
> need.  It is my understanding that an FXO card is used to interface with
> an incoming/outgoing phone line, and an FXS card is used for interfacing
> with a phone within the system.  Currently we have 4 incoming/outgoing
> phone lines and would like to have 20 phones in the system.  In order to
> accomodate this, would you either reccommend having 1 TDM04B (4 FXO
> modules on it) for the 4 incoming/outgoing lines, and 5 TDM40B (4 FXS
> modules on each) for the 20 phones we would have in the system.  Or
> would you reccommend 1 TDM04B for the 4 incoming/outgoing lines, and a
> T100P connected to a channel bank of some sort to connect to the
> internal phones?  If you reccommend the T100P and channel bank, where do
> you suggest I get an FXS channel bank?  Please let me know if I got any
> of this mixed up (like if I got the FXO and FXS cards mixed up) and
> thank you in advance for your help in us deciding the hardware we need
> for a new PBX.
> 
> Andrew Elchuk
> 
> P.S.  We are currently using an X-Like software phone with a free world
> dialup account for communication with our other office in a different
> city.  My question is if I can configure the extensions.conf to connect
> to a free world dialup number when executing a dial command, or would I
> need to edit sip.conf as well or some other configs or is that even
> possible?  Thank you again.
> 
> --
> Andrew Elchuk
> Technical Associate
> Cronus Technologies
> 248 - 111 Research Drive
> Saskatoon, SK  S7N 2X8
> Tel: (306) 652-5798 ext. 112
> Fax: (306) 652-5799
> Toll Free: 1-877-655-5798
> http://www.cronustech.com
> 
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