Testing your BT TwinTalks
To check the GuardCall operation lift one of your handsets and make a call to the speaking clock - dial 123. Do not replace the handset but lift the other handset. GuardCall will ensure that you cannot interrupt the call to the speaking clock and on most telephones you will not be able to listen in to the call.
You will note when you transfer an incoming call on your BT TwinTalk system that only one phone will be connected to the line at any time - this GuardCall operation is designed to ensure the privacy of your call. When you are transferring an incoming call on your TwinTalk system simply replace the handset at one extension and pick it up at another. Click on the blue arrow to view these stages again: