Step 1: TwinTalk delays ringing
When you are using TwinTalk on your line your phones, faxes and answer machines will ring slightly later than they would if TwinTalk is not connected. During this delay TwinTalk is analysing the incoming ringing pattern, which is based upon the number your caller has dialed, before it decides whether to connect the attached phone to the ringing signal, or not.
If you subscribe to BT's Caller Display service and your phone is capable of displaying your caller's number you may observe that your corded caller display phone operates a little differently when connected to your line through BT TwinTalk. If you have a cordless DECT phone which uses the Caller Display visit our DECT Support page.
Your phone will receive the caller display signal at the usual time which is about 1.5 seconds before ringing is applied to your telephone line. TwinTalk will delay passing the ringing to your phone for an additional 3 to 6 seconds, or it will continue to block the ringing signal. This delay may affect the Caller Display on your phone.