scope:

The present document describes the message flows and the specific messages to be used between GSM-R networks to enable numbering plan mapping functionality for the exchange of SMS.

In detail:

• Message flows covering the different call types using functional numbers as part of the EIRENE numbering plan.

• Description of USSD Messages to allow the functional number/E.164 [i.2] mapping between the involved GSM-R network entities.

• Description of the SMS address field content to allow presentation of the functional number or E.164 number [i.2] to the terminating party.

Mapping of EIRENE/Recommendation ITU-T E.164 [i.2] numbering plans and the resolution of the functional number that belongs to the subscribers located in the home network is out of scope of the present document.

NOTE: To minimize standardization and implementation effort, all protocols used to exchange the numbering plan mapping information are standard 3GPP/ITU protocols and only specific settings are used for the exchange of the relevant information