Interworking ANM or CON 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

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

Redirection Number

The SBC only interworks this category if it receives a Diversion header with Reason. 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 Indicator—The SBC always inserts the value ISDN.

Redirection Number Restriction

The APRI is the only parameter interworked for this category:

• 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.