Asterisk with DK280

We will be moving to VOip in the near future. What we are trying to do right now is use the asterisk system, in conjunction with a Toshiba Strata DK280. We will have approx 10 ip phones that we want to use to begin with. We have server running asterisk, with a Digium TE205P installed. We want to run all calls through the Strata, and then have calls for those particular extensions handed off to the Asterisk server, and vice versa. All outgoing calls would go from the Asterisk server, through the Strata. Is this possible ? If anyone has attempted this let me know. We have had some success using an FXS/FXo card in the Asterisk server, along with analog ports on the Strata.