Each FXO of PBX connects to each communication to integrate and save expenses.

1. Connect all of the GP-510 with PBX.
2. Set up Line1 as Telecom.A; Line2 as Telecom.B; Line3 as Skype.
3. Pair each Bluetooth Mobile and PC to different GP-510.
4. Now, you have many choices to dial. If you want to dial out via Telecom.A, just press Line1 in your table phone and dial.