Asterisk + Legacy PBX


I am using asterisk and all things are going perfectly except that i want to connect asterisk with our panasonic pbx through FXS.

I have connect one extension (250) of panasonic pbx with fxs gateway (225) so when any one from asterisk dial 225 than call land on panasonic pbx extension 250 without any problem. but i am not sure how to dial asterisk extension from panasonic extension.

From panasonic pbx extension 250 when we dial 9 for dial tone than we receive dial tone from asterisk but when we dial asterisk extension number than there is no response.

Nothing happen on asterisk CLI.