Axxess system, call router pc, reception pc(axxessory console) all are sitting behind this firewall which uplinks to the internet and allows the remote admin. So now that I say it I quess it shouldn't place any restrictions on the devices that are sitting behind, sorry about the misdirection. Day mode call routing DID's from the PRI to local reception ext 1500 and in some cases to other local ext's/fax ext's.