With our old Panasonic PBX system, we could transfer an external call to an external number using Flash and then dial the number. After the transfer was complete, all of our incoming lines were clear (I am guessing that the transfer is handled by the PSTN line provider). With pbxnsip, when I forward to an external number, it uses a second channel to make the outgoing call. This now ties up two PSTN lines (versus zero with the old system) for the duration of the call. Is there anyway to configure the software to perform an external call transfer?