4 Cross-Phase compatibility
23.0883GPPCall Barring (CB) supplementary servicesRelease 17Stage 2TS
For the following supplementary services, a number of changes exist between the present document and the Phase 1 specification:
– Barring of outgoing calls;
– Barring of incoming calls.
The main body of the present document assumes that all network entities comply with this version of the service. In each case an additional clause (clauses 6.6 and 7.6) defines the additional requirements for when one or more network entities or the MS complies with the Phase 1 specifications for the supplementary service procedures.