[Asterisk-Users] Toshiba CTX100 integration with PABX for two site

[Stephen]

Hi All,

I need to connect two sites with asterisk integrated with Toshiba ctx100.
Currently both have 4co and 8 extensions.

Site A starts the extension with 8xx and Site B starts the extension 
with 1xx.

How can I integrate two sites with asterisk that is transparent to users 
(which mean users at site B only needs to dial 8xx via asterisk and 
extension at site A rings and vice versa) ?

Do I need two asterisk servers at both ends with FXO cards and FXS cards 
with loop back to Toshiba Co line ?

Thanks and Regards,
Stephen