Interworking ACM or CPG with Diversion Information

When configured for native IWF and in receipt of diversion information, the SBC interworks the following parameter groups in addition to those documented previously:

• Redirection Number
• Redirection Number Restriction
• Generic Notification Indicator

For any overlapping interworking, the SBC uses the values in this diversion information list.

Redirection Number

Parameters interworked for this category include:

• Address Signal—The SBC inserts URI of the selected Diversion header. If there are multiple headers, it uses the first (top).

• Nature of address—The SBC inserts the following values into the IAM, based on the conditions described:

  • National, if there is no + in the number (encoded to 0000011).
  • International, if there is a + in the number (encoded to 0000100).
• Internal Network Number Indicator—The SBC always inserts the value 1 routing to internal network number not allowed.
• Numbering Plan—The SBC always inserts the value ISDN.

Redirection Number Restriction

Parameters interworked for this category include:

• APRI—The SBC maps the Privacy SIP header to the APRI.
  • If the SIP Privacy value is absent or set to none, map the APRI to presentation allowed.
  • In all other cases, map to presentation restricted.

Generic Notification Indicator

In addition, the SBC sets the Generic Notification Indicator in the ACM or CPG to Call is Diverting.