1. Element Based Charging (EBC) used within both BT Basic and BT Transit Telephony Element Based Charging uses switch related elements for charging. This allows BT to recover costs based upon the amount of ‘work’ done within our network when carrying a call, depending on how much switching and how far (in some cases) we carry the call before delivery. This method of charging is applicable for services such as BT Basic Telephony Part 1.01, BT Indirect Access (Part 1.10) and BT Transit to CP Telephony Part 1.12. As part of BT’s Least Cost Routing methodology, the actual route of each call is not considered, but the ‘shortest path’ is used. Further, for BT Transit and BT originating traffic the exit PoC used for charging is not the actual exit PoC but the exit PoC derived from the routing plans. Using this method, all possible call routes are considered when evaluating the ‘shortest path’, so that an operator is never over-charged for a call. The customer is always charged based upon the theoretical least cost (shortest) route ! The EBC bands are described in the following slides...

2. Element Based Charging (EBC) BT Terminating BT DMSU BT DLE BT customer CP SWITCH BT DLE BT customer CP SWITCH BT DMSUBT DLE BT customer CP SWITCH BT DMSU Local Exchange Single Tandem Double Tandem For calls originating on a CP network and terminating on the BT network (Part 1.01) For Double Tandem calls there is an additional distance element (short 200km (529)). The distance between all DMSUs (there may be more than two) is considered for this distance element. Distance element

3. Element Based Charging (EBC) CP Terminating (TRANSIT) BT DMSU CP B customer CP A SWITCH Single Tandem Double Tandem For calls originating on a CP network, transiting the BT network and terminating on another CP network (Part 1.12) For Double Tandem calls there is an additional distance element (short 200km (529)). The distance between all DMSUs (as there may be more than two) is considered for this distance element. Local Exchanges cannot be used as transit switches and therefore there is no Local Exchange element for transit call types. CP B SWITCH BT DMSU CP B customer CP A SWITCH CP B SWITCH BT DMSU Distance element