Body
When a call has been answered:
Step One: Press Trans (Transfer)
Step Two: Dial the number to connect the call to. Don't forget to dial 66+1 for external numbers first!
Step Three: If the call goes through, press Connect.
Step Four: If the call fails, press Goodbye then select the line you were on previously to return to the original call.
The buttons may be different for the various phone models.