For non-ISDN trunks, Periodic Pulse Metering (PPM) accumulates pulses that are transmitted from the public network at periodic intervals during an outgoing trunk call. At the end of the call, the number of pulses collected is the basis on which charges are determined.

Call-charge information helps you to account for the cost of outgoing calls before you receive the call charges from your network provider. The ability to account for the cost of outgoing calls before you receive the call charges from your network provider is especially important in countries where telephone bills are not itemized.

You can also use the information about the cost of outgoing calls to give the cost of telephone calls to employees. The cost information of outgoing telephone calls can help users to manage their use of company telecommunications facilities. Note, however, that you cannot necessarily use the call charge information that the Call Charge Information feature provides to reconcile telephone bills with your network provider.

You must request either AOC service or PPM service from your network provider. In some areas, your selection is limited. Note that the public network does not offer AOC service and PPM service in some countries, including the US. In some countries, AOC information is received automatically for each call. In other countries, the system must request AOC information for each call. Your Avaya representative can help you determine the type of service that you need.

In some countries, the public network sends call-charge information only at the end of a call. In other countries, the public network sends information both at the end of the call and while the call is in progress. PPM is available over the following trunk types: