2.31.2 SCCP Screening

SCCP (Signaling Connection Control Part) includes screening of signalling traffic on the basis of Called and Calling Party Addresses global title using appropriate CGPA (Calling Party Address), CDPA (Called Party Address) GTT (Global Title Translation) Set types, FLOBR (Flexible Origin Based Routing) and GTT actions.

Example Use Cases

• Use incoming linkset to screen messages on the basis of CDPA for SCCP routed Messages

  Figure 2-36 Use Case 1

  
  

  

  
  

  Figure 2-37 Linksets GTT Mode FLOBR_CDPA

  
  

  

  
  

  Figure 2-38 GTT Sets

  
  

  

  
  

  Figure 2-39 SCCP GTT Selectors

  
  

  

  
  

  Figure 2-40 GTT Actions

  
  

  

  
  

  Figure 2-41 GTT Action Sets

  
  

  

  
  

  Figure 2-42 Global Title Addresses

  
  

  

  
  
• Use incoming linkset to screen messages on the basis of CDPA followed by Opcode translation for SCCP routed Messages.

  Figure 2-43 Use case 2

  
  

  

  
  

  Figure 2-44 Global Title Addresses for opcode set

  
  

  

  
  

  Figure 2-45 Global Title Addresses (Continued)

  
  

  

  
  

  Figure 2-46 Global Title Addresses (continued)

  
  

  

  
  
• Use incoming linkset to screen messages on the basis of CDPA/CGPA for MTP3 routed Messages.

  Figure 2-47 Use Case 3

  
  

  

  
  

  Rest configuration is similar to use case 2. Ensure to add MTP3 Screening Rules on SCCP SIO (Service Information Octet) so that packet reaches SCCP.

• SMS Fraud from an Outside Network

  Figure 2-48 Use Case 4

  
  

  

  
  

  Configure two GTT Sets cgpaset1 and cgpaset2.

• Configure GTT Selectors as follows:

  Figure 2-49 SCCP GTT Selectors

  
  

  

  
  

  Configure GTA (Global Title Address) for cgpaset2 as discard GTT action and GTA for cgpaset1 to be routed to RSP (Remote Signaling Point).