 Signaling area/network code (SANC) International signaling point codes (ISPC) First bit transmitted Figure 14.8 Format for international signaling point code (ISPC). [From ITU-T Rec. Q.708, Figure 1/Q.708, page 1 (Ref. 12).] 5 Note here that the alphabet is running backwards, thus K, J, I, H, G CCITT SIGNALING SYSTEM NO. 7 geographical area or network. The combination of the first and second subfields is called a signaling area/network code (SANC). Each country (or geographical area) is assigned at least one SANC. Two of the zone identifications, namely, 1 and 0 codes, are reserved for future allocation. The ISPC system provides for 6 X 256 X 8 (12,288) ISPCs. If a country or geographical area should require more than 8 international signaling points, one or more additional signaling area/network code(s) would be assigned to it by the ITU-T organization. A list of SANCs and their corresponding countries can be found in Annex A to ITU-T Rec. Q.708 (Ref. 12). The first number of the code identifies the zone. For example, zone 2 is Europe and zone 3 is North America and its environs. 14.11 SIGNALING CONNECTION CONTROL PART (SCCP) 14.11.1 Introduction The signaling connection control part (SCCP) provides additional functions to the message transfer part (MTP) for both connectionless and connection-oriented network services to transfer circuit-related and noncircuit-related signaling information between switches and specialized centers in telecommunication networks (such as for management and maintenance purposes) via a Signaling System No. 7 network. Turn now to Figure 14.3 to see where the SCCP appears in a functional block diagram of an SS No. 7 terminal. It is situated above the MTP in level 4 with the user parts. The MTP is transparent and remains unchanged when SCCP services are incorporated in an SS No. 7 terminal. However, from an OSI perspective, the SCCP carries out the network layer function. The overall objectives of the SCCP are to provide the means for: Logical signaling connections within the Signal Sy