This ETS defines a set of bearer services to be provided to GSM PLMN subscribers by a GSM PLMN itself and in connection with other networks. This ETS should also be used as a reference for defining the corresponding required mobile network capabilities which are specified by means of the GSM PLMN connection type concept, defined in GSM 03.10. The recommended provision of the bearer services is under the control of the GSM MoU and is out of the scope of ETSI/TC/SMG. Bearer services not included in this specification that require modifications to the GSM signalling specifications should not be introduced unilaterally by a mobile network operator.
