[Asterisk-Users] Problem developing my office

[Eric Wieling aka ManxPower]

Franck Porcher wrote:
> Le lundi 09 Mai 2005 23:56, Michele "O-Zone" Pinassi a écrit :
> 
>>Hi all,
>>i need some advices. In my office we have 7 PSTN lines from central
>>phone-office (one line - one number) and we plain to install an Asterisk
>>server as PBX. We need to have 15 PSTN devices (phones, fax, etc) in opur
>>office. I've seen FXS and FXO but i'm not sure: we need 7 FXO
> 
> Yes, 1 per incoming line, as long as you plan to keep them all.
> 
> 
>>and 15 FXS ?!?!?!?!?
> 
> Theoretically, you need 1 FXS module per downstream PSTN phone you want to 
> signal with Asterisk. Have you consider switching to VOIP (hard)phones, be 
> IAX2 or SIP, since for those, you would not need any extra hardware at all ? 
> Very good quality brands and models available (see Asterisk wiki).

If you want to stick with analog lines and analog phones then you want 
to use a T-1 card in the Asterisk box with a Channel bank with 7 FXO and 
15 FXS ports.  A channel bank converts T-1 channels into analog ports.

--Eric
-- 
Eric Wieling * BTEL Consulting * 504-210-3699 x2120