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ITU-T D.93 Document Information:
Title
Charging and accounting in the international land mobile telephone service (provided via cellular radio systems)
International Telecommunication Union/ITU Telcommunication Sector
Publication Date:
Jan 1, 2009
Scope:
General considerations
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.
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.
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.
As part of the bilateral agreement, the HPLMN should undertake
to pay the VPLMN the charges incurred by the HPLMN registered
mobile subscribers.
Examples of the application of the charging and accounting
principles, set out below, for various call routing scenarios are
given in Annex A.
Definitions
home PLMN
The PLMN in which a mobile station is permanently
registered.
home location register
The location register to which a mobile station is assigned for
record purposes such as subscriber information
visited PLMN
The PLMN, other than the home PLMN, in which a roaming
subscriber is currently located.
visitor location register
The location register, other than the home location register
used by an MSC to retrieve information for, for instance, handling
of calls to or from a roaming mobile station, currently located in
its area.
mobile station roaming number
The network internal number used for routing of calls to the
mobile station. See Recommendation ITU-T E.213.
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