22.4.2 Procedure in the MSC

29.0023GPPMobile Application Part (MAP) specificationRelease 17TS

The A_ACTIVATE_SS service indication received by the MAP user in the MSC contains the SS-Code and any parameters related to the supplementary service.

The MSC transfers the received information to the VLR in the MAP_ACTIVATE_SS request without checking the contents of the service indication. Rules for the mapping are described in 3GPP TS 29.011 [59].

The information in the MAP_ACTIVATE_SS confirm from the VLR is relayed to the MS in the A_ACTIVATE_SS response message, as described in TS 24.08x, 3GPP TS 24.08x and 3GPP TS 29.011.

For call independent SS operations, each message shall contain only a single component. Messages which contain more than one component will be stopped at the air interface (as specified in 3GPP TS 29.011 [59]).

The activation process in the MSC is shown in figure 22.4.2/1.