Asterisk and td500

have this problem with my asterisk box. im am trying to connectect the asterisk to a Panasonic td500 pabx. The asterisk is calling the td500 extensions but they cannt call the asterisk. im am using an fxo card on the asterisk server. any body with an idea on how to configure the td500 pabx?

You may want to contact Panasonic for information on their PBX. What happens when you try to call the asterisk box ? Anything come up in the CLI ? Did you set up incoming rules for the context that you set in zapata.conf ?