[asterisk-users] ATA being used as a SIP Trunk to connect LegacyPbx to Main Asterisk Server

[Rich Adamson]

Marco Mouta wrote:
> Hi all,
> 
> Do you think it could be an affordable solution using a two fxs ATA 
> device to connect an old legacy pbx (with few users) with a main 
> asterisk server.
> 
> 
> phones----analogue----SmallOfficeLegacyPBx----ATA-2FXS-----SIP------MainOffice 
> AsteriskServer
> 
> This way also I would use ATA device as a Trunk without requiring an 
> Asterisk server on every smalloffice and no need to buy many ATAs 
> neither VoiP hardphones.
> 
> Is this affordable or i'm missing already basic functions required for a 
> production system?

One item you will need to research and tends to create problems for 
people doing this is  line supervision.  In other words, disconnect 
supervision, answer supervision, etc, are often times not provided by 
legacy pbx's, and therefore the ATA may not recognize hangups, etc.