Step 2: Telephones which operate differently connected through BT TwinTalk
The BT Synergy 3200 has an illuminated display. This display uses ringing energy to illuminate the display and when TwinTalk blocks ringing the display light will remain off. The telephone number of your caller can still be read clearly under normal lighting conditions.
Some other Caller Display phones will not clear the Caller Number unless they receive ringing which subsequently ceases.
If the operation of your Caller Display phone changes when connected to BT TwinTalk then we would be grateful if you could email us with the details so that we can keep this list complete and up to date.