I have several Avaya 4610SW IP Phones (model 4610D01A). Currently, I managed to configure it as an extension to my FreeSWITCH IP PBX System using SIP firmware (s10d01b2_2_2.bin). The only problem I see is all 5 lines registered as a single extension. I sure would like to know if it is possible to configure each of its 5 lines with many different Voice over IP providers, i.e. Line 1 as an extension to my PBX System, Line 2 registered directly to SIPGate (UK), Line 3 registered to IPComms, etc. Anyone?