I am terribly new at this VOIP PBX thing, and I have checked the blog for similar issues w/o success. SO . . .Does anyone know I might configure a Linksys SPA3000 or Grandstream 4108 in order to generate a flash hook signal to the local PSTN carrier so I can activate that provider's call transfer and/or conference calling features? I have the 3CX PBX configured with both of these gateways, and all seems to be working well, but I can no longer access these features offered by the local carrier. When I try the transfer button on my voip phone, I receive the message that the destination is unknown, not registered, etc. When I check the server log, it looks like the PBX is attempting to obtain another line on the gateways rather than transmitting a flash hook signal. If I hit the flash hook on the phone, I disconnect the original caller. Pointers GREATLY appreciated!!!