Charging and accounting in the international land mobile telephone service (provided via cellular radio systems) SERIES D: GENERAL TARIFF PRINCIPLES General tariff principles ?Charging and accounting in the mobile services Study Group 3
1.1 In the land mobile telephony service, the Home Public Land Mobile Network (HPLMN)
will know the location of all operational mobile stations for which it is the home registered network,
when the station is operating within its HPLMN or has roamed in accordance with the principles
contained in ITU-T Recommendations of the Q.1000 series.
1.2 The Visited Public Land Mobile Network (VPLMN) will be able to access and record the
necessary details of any mobile station which has roamed and registered with it, such that it can
forward all necessary billing information to the HPLMN.
1.3 Mobile stations will only be able to roam to another Public Land Mobile Network (PLMN):
? upon the conclusion of a bilateral agreement between PLMNs;
? upon the granting by the HPLMN of the option to roam to the mobile station.
1.4 As part of the bilateral agreement, the HPLMN should undertake to pay the VPLMN the
charges incurred by the HPLMN registered mobile subscribers.
1.5 Examples of the application of the charging and accounting principles, set out below, for
various call routing scenarios are given in Annex A.