Signalling Connection Control Part - Routing Facilities Beyond MTP

Routing Facilities Beyond MTP

Although MTP provides routing capabilities based upon the Point Code, SCCP allows routing using a Point Code and Subsystem number or a Global Title.

A Point Code is used to address a particular node on the network, whereas a Subsystem number addresses a specific application available on that node. SCCP employs a process called Global Title Translation to determine Point Codes from Global Titles so as to instruct MTP on where to route messages.

SCCP messages contain parameters which describe the type of addressing used, and how the message should be routed:

  • Address Indicator
    • Routing indicator
      • Route on Global Title
      • Route on Point Code/Subsystem Number
    • Global title indicator
      • No Global Title
      • Global Title includes Translation Type (TT), Numbering Plan Indicator (NPI) and Type of Number (TON)
      • Global Title includes Translation Type only
    • Subsystem indicator
      • Subsystem Number present
      • Subsystem Number not present
    • Point Code indicator
      • Point Code present
      • Point Code not present
  • Global Title
    • Address Indicator Coding
    • Address Indicator coded as national (the Address Indicator is treated as international if not specified)

Read more about this topic:  Signalling Connection Control Part

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