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564 INTELLIGENT NETWORK APPLICATION PARTTABLE 18.3-3Examples of CS-3 Service Features (Additional to CS-2)Category Service Feature AcronymUser Basic features Carrier selection handling CSHNDCCBS supportCCBSSIN-IP network interworking Request-to-call CSN RQTCCNumber portabilityService provider portability forSPPGNgeographical numbersMobility support UPT registration with smart card SCREGNetwork Basic features Multiple points of control MPCTRMobility supportDynamic trigger detection point (TDP) DTDPAactivation/deactivationNumber portability Network routing number trigger NRNTRTABLE 18.3-4Examples of CS-4 Service Features (Additional to CS-3)Category Service Feature AcronymUser Basic features Support CUG capability SCUGCSupport for local advertising towardSLAMSmobile subscribers (IMT2000)IN-IP internetworking Internet call waiting ICWTGRequest to call IPRQTCINetwork Basic features Call party handling signaling relationship CPHSRInter-SCP network capability negotiation ISNCNIN-IP interworking Support for IP addressing SFIPACooperation between Network request for temporary connection NRTCnetworksPrivate network request to initiate call NRICCS-4. This set enhances the CS-3 capabilities with support of IP connectivity(Chapter 20) and of supplementary services [18,19]. CS-4 services are a supersetof CS-3 and examples of additional features can be found in Table 18.3-4.18.4 INAP SIGNALING18.4.1 OverviewThe INAP protocol provides the signaling functionality required by the IN applicationto realize services hosted in distributed (remote from each other) physicalelements [20].The communication function of a functional element contained in a PE consistsof one or more application entities (AEs), each comprised of several applicationservice elements (ASEs). The relationship between AEs and ASEs is discussed inSection 14.2. INAP messages are the physical realization of information flowsbetween FEs.