Since a homogeneous, compatible service spectrum is the objective for the services of GSM PLMNs, standardization of the charging mechanisms for collection charges is the minimum requirement. This is especially important as mobile subscribers can move in different GSM PLMNs. It is therefore the objective of this recommendation to standardize at least those charging mechanisms which play a role in the technical definition of GSM PLMNs.
The recommendation deals with the charging mechanisms related to GSM mobile originated calls and with the forwarded element of GSM mobile terminated call (i.e. when the GSM mobile subscriber is roaming), hereafter referred to as "the mobile terminated component".