12 Charging aspects
22.0663GPPService descriptionStage 1Support of Mobile Number Portability (MNP)TS
Enough information shall be collected to allow different tariffs to be applied to calls and short messages in the following case:
The calling subscriber is roaming in her home PLMN
and
The called subscriber is a subscriber of any of the PLMNs in the country of the calling subscriber’s home PLMN
In this case the collected information shall allow to distinguish between
Calls and short messages directed to a called subscriber who subscribes to the calling subscriber’s home PLMN
Calls and short messages directed to a called subscriber who does not subscribe to the calling subscriber’s home PLMN.
Enough information should be collected to allow the involved networks to workout inter-network charging.