Billing Principles

Billing Principles
• The GSM Specification for billing assumes the following
principles:
• For MO calls, caller pays for connection to dialled
number (caller does NOT pay for call-forward element)
• For MT calls the called party pays for call-forward part
of connection
• For MT calls, the called party pays for any roaming
extension part of the connection
• Charge rates can be based on one or a combination of:
• duration, location, destination, service, time of day, type of day,

In deriving this specification the following principles are assumed:
1. For mobile originated calls, the mobile user pays for the connection to the dialled number,
as per the published tariff of the Local PLMN, plus a mark-up defined by the HPLMN to
cover additional administration costs, when roaming. It is assumed that the MS subscriber
will NOT be charged for the forwarded leg if the dialled number has set call forwarding. If
additional charging is required for this forwarded leg, then it is assumed that such charging
will be applied only to the called party.
2. For mobile terminated calls, any charge set for incoming calls is that based on the tariff as
published by the HPLMN. The tariff as published for the roaming extension charges is
assumed to be time and date invariant.
3. Charge rates for calls originating within a PLMN vary depending upon, for example,
location, destination, service, time of day, type of day and any mark ups.