Firmware required for interoperability of xbee Znet 2.5 with iris mote

I would like to use both iris motes and xbee Znet2.5 for my WSN. Is it possible for setting up the network? If possible, which firmware i have to update in xbee. Thanks in advance.

No it is not possible as from what I can find, the iris mote is an 802.15.4 compliant device and the Znet 2.5 modules are not.