if you can make a station to station call between the two systems then its just a mater of getting your ARS setup right and a COR ( or whatever they are called on a Axxess ) setup so the PRI between system s can access an outside line. Not knowing the Axxess I would assume you need to setup your ARS on the 3300 so it sends the 9 plus the number you want dialed to the Axxess. Normally the 3300 would be setup to absorb the trunks access code of 9 if it had its own PRI. We have attached 3300's to 5000's via SIP, Cisco and Nortel system via PRI and been able to route all calls out whichever system had the trunks with no problems.