Telephone/PBX dial to GSM
  Pepole don't change the dialing habit.
The most important is to be far away from electromagnetic wave and save expenses.
Memorize 100 sets phone book in telephone.

Connect to FXO of PBX to let peple in office can dial in GSM or dial out GSM.

   
  Hardware Device1
  1.Connect to Phone
  2.Connect to PSTN (optional)
  3.Turn on Power
 
   
  Hardware Device2
  1.Connect FXO of PBX with Phone
2.Connect to PSTN (optional)
3.Turn on Power
 
   
  Software set up
  1.Prepare Bluetooth Mobile and GP-510 to pair
  2.Set up the location what you are(if you need,you also can set up the local code)
3.Set up the object that 510 will pair to