SS-InvocationNotificationRes Message
This service is used between the MSC and the gsmSCF when the subscriber invokes one of the following supplementary services; Call Deflection (CD),
Explicit Call Transfer (ECT) or Multi Party (MPTY). This service is used between the HLR and the gsmSCF when the subscriber invokes the CCBS supplementary service.
ss-InvocationNotification is a consumer invoke.
Reference: TS 29.002-f30