t purpose only, they belong to the logical element in the reference model Service network drawn without content provision Figure 8.6 3GPP network architecture, example Upper part: New implementation of IN services. Lower part: Traditional implementation in vertical networks Terminal if any Other network Applications IN service logic API (Parlay, OSA) NRG = Network NRG SCS resource gateway MAP, CS1(+) Firewall MSC, TeS, GMSC Server Server Server SCS = Service capability server Access Core connectivity FW = Firewall SCP = Service Corresponds to control point IN Network intelligence control network in the CS1 (+) new network Switch with control part SSP = Service switching point Figure 8.7 Conceptual view of IN services Understanding Changing Telecommunications - Building a Successful Telecom Business Access External equipment network network networks UMTS access UTRAN Packet core domain Intranet Extranet Internet - Corporate (IW)MSC GSM/(GPRS) access MSC/VLR Note: All interfaces not shown SMS short message service SMS-IWMSC short message service interworking MSC Figure 8.8 The UMTS network before physical separation of connectivity and control layers - instead there is a clear separation between the classical circuit-switched domain and the packet domain IN/VAS/service enablers Alternative Legacy mobile Applications & Multimedia signaling network access services *) IP networks network R-SGW *) CAP = CAMEL application part CAMEL = customized application for mobile network enhanced logic T-SGW *) UTRAN PSTN/ legacy/external GERAN Separation MSC server GMSC server T-SGW *) control- Transport signaling connectivity CAP gateway CS domain Applications & services *) HSS *) R-SGW *) with gateways and servers Roaming SGW IN/VAS/service enablers These elements are duplicated for figure layout purpose Signaling interface only. They belong to the logical element in the reference Signaling and data transfer interface model service network drawn without content provision Figure 8.9 The control and connectivity are separated in t