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7.4 ACRONYMS 165Figure 7.3-3 shows the message transfer primitives between MTP3 and aMTP-user at a signaling point. On outgoing messages, the user passes a MTP-transferrequest that includes the user message and the parameters in SIO and RL. Onincoming messages, MTP3 delivers these data to the MTP-user, in a MTP-transferindication that contains the same information.7.4 ACRONYMSANSI American National Standards InstituteCB Check bitCCIS Common-Channel Interoffice SignalingCCITT International Telegraph and TelephoneConsultative CommitteeCIC Circuit identification codeFFlagFISU Fill-in signal unitISC International switching centerISO International Standards OrganizationISDN Integrated Services Digital NetworkISUP ISDN User PartITU International Telecommunication UnionITU-T Telecommunications Standardization Sector of ITUkb/s Kilobits per secondLILength indicatorLSSU Link status signal unitMSU Message Signal unitMTP Message Transfer PartOSI Open Systems InterconnectionPC Point codePCM Pulse code modulationRL Routing labelSCCP Signaling Connection Control PartSIF Signaling information fieldSIO Service information octetSL Signaling linkSP Signaling pointSS6 Signaling System No. 6SS7 Signaling System No. 7STP Signal transfer pointSU Signal unitTCAP Transaction Capabilities Application PartTUP Telephone User PartUM User message