IPBXs with GXW4502


I have 2units grandstream UCM6208 IPBXs and also Gateway GXW4502 for E1 digital connection placed on separate floors in the same building so there could be physical cabling from floor A to floor b even though they are on separate network (firewall)
pls i need to know what method of network setting on the GXW4502 should be made either SWITCH, ROute or DUAL, so that i could enable the the two network UCMs to have connection to the GXW4502 for E1 link.
kindly reply on this.


This depend on your network not on UCM. Without knowledge about your network topology nobody can answer.
Usually internal go switch.