scope:

The present document specifies the DSS1 and ISUP aspects for the transfer of the MMS-related information in support of the Multimedia Messaging Service (MMS, see [4]) for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators at the T reference point or coincident S and T reference point (as defined in ITU-T Recommendation I.411 [7]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol and in the network by means of Signalling System No.7 ISDN User Part (ISUP). The present document specifies also the interworking between ISUP and DSS1 for MMS purposes.

In addition, the present document specifies the protocol requirements at the T reference point where the service is provided to the user via an intermediate private ISDN.

The present document does not specify the additional protocol requirements where the service is provided to the user via a telecommunication network that is not an ISDN but it does include interworking requirements of other networks with the public ISDN.

The MMS is provided using the bearer capabilities of the B-channel which have to be established by DSS1 and the connections which have to be established by ISUP.

The means by which the receiving user manages these features are outside the scope of the present document.

The preparation of an MM as well as the kind of data transmission between the sending or receiving users and the MMSC are outside the scope of the present document.

Charging principles are outside the scope of the present document.

The present document is applicable to equipment supporting the MMS, to be attached at either side of a T reference point or coincident S and T reference point when used as an access to the public ISDN.

Other documents specify further aspects of MMS, see Foreword.