C.1 Purpose

24.0083GPPCore network protocolsMobile radio interface Layer 3 specificationRelease 18Stage 3TS

This annex describes principles that shall be used when the calling MS specifies information during call setup regarding low layer capabilities required in the network and by the destination terminal. Refer also to 3GPP TS 27.001 [36].

NOTE: In this context and throughout this annex the term "called user" is the end point entity which is explicitly addressed. This may also be an explicitly addressed interworking unit (IWU) (see ITU-T I.500-Series Recommendations and ITU-T Recommendation X.31 case a).