Interworking IAM with Diversion Information
When configured properly and in receipt of diversion information, the SBC interworks the following parameter groups in addition to those documented previously:
- Redirection Number
- Redirecting Information
- Original Called Number
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).
- 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.
Redirecting Information
Parameters interworked for this category include:
- Redirecting Indicator—The
SBC uses the following
mapping:
- Privacy header absent or set to none—The SBC inserts the value Call diverted.
- Privacy header set to any other value—The SBC inserts the value Call diverted, all redirection info presentation restricted.
- Original Redirection Reason—The SBC always maps this value to Unknown.
- Redirection Counter—The SBC inserts the sum of the counters of all Diversion headers in the SIP message.
Original Called Number
For Original Called Number, mapping includes:
- Address Signal—The SBC inserts the URI of the selected History-Info or Diversion header. If there are multiple headers, it uses the last (bottom).
-
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).
- Numbering Plan Indicator—The SBC always inserts the ISDN (Telephony) numbering plan; (Recommendation E.164)
- 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.