[asterisk-users] interfacing asterisk with a legacy PBX

[Paul Hales]

On 24/10/09 00:59, Lyle Giese wrote:
> PATRICK KANGETHE wrote:
>> I want to interface asterisk with a legacy pbx that has around 23 
>> extensions through my 8 fxs card, how do i work around this?
>> Hint: I have already terminated 8 extensions from the legacy PBX, i 
>> was thinking whether i can peer the extensions from the PBX i.e like 
>> 5 extensions be peered to one extension connecting to the fxs? How 
>> can i do this?
>>
>> Thanks in advance,
>>
>> ------------------------------------------------------------------------
> Are you planning to get rid of the legacy PBX completely?  Or is 
> Asterisk going to be a second PBX?
>
> I am going to assume you are replacing the legacy PBX.  You can setup 
> analog extensions so that you have multiple phones on each FXS 
> channel.  But they will be like a party line.  If you put 6 phones on 
> one FXS, all 6 ring at the same time, only one person can use that 
> extension at a time.
>
> However you can add SIP phones to Asterisk and each can have their own 
> extension instead.  It just requires cat 5 cable back to a switch for 
> each phone.
>
> Lyle Giese
> LCR Computer Services, Inc.

Just to add my 5 cents - connecting too many phones to an FXS port can 
cause problems. The term is REN - ring equivalent number, and it's used 
to describe the maximum phones to attach to an FSX port (from memory)

PaulH

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