Testing your BT TwinTalks
Hang up the mobile, or the the phone you are calling from, and dial your new number. This time the phone connected to the TwinTalk which has the switch set towards it's line cord should ring.
If the phones do not ring as described above you may have a wiring fault in your extension telephone socket wiring or you may have a particular DECT cordless phone connected to the extension which did not ring correctly. Follow the highlighted links for help.