The ISDN BY-Pass Number feature is no longer available for new supply and will be retired on the 31st July 2007.
Charges apply per directory number or contiguous number range. Where calls are diverted or forwarded, the diverted part of the call is charged to the renter of the service at standard charges including any applicable discounts. Calling customers pay the call charge only to the number which they have dialled and not to the diverted number.
BT Digital Calling Features provide enhanced call handling facilities on calls made and received by ISDN2, 2e lines, Business Highway lines and ISDN 30/30e channels. Some BT Digital Calling Features can only be provided and removed by BT while others can be activated by the customer. Usually individual BT Digital Calling Features are charged by a quarterly rental without set up charges for each directory number or contiguous Direct Dialling In number range (where this applies to ISDN2/2e lines or ISDN30/30e channels). The service, once provided, applies to all calls to or from the relevant directory number or contiguous DDI range.