1. Configuration Guide
  2. SIP Signaling Services
  3. SIP SIP-I Interworking
  4. Supplementary Service for COLP and COLR

Supplementary Service for COLP and COLR

During SIP-I to SIP calls, if the 200 OK message received from the IMS node contains a P-Asserted-Identity header, the SBC encodes some parameters of ISUP messages. The SBC only performs this function if the P-Asserted-Identity header is in SIP, SIPS or Tel-URI format. If Tel-URI format is accompanied by SIP and/or SIPS format, theSBC uses the header in Tel-URI format.

Connected Number

Connected Number subfield interworking includes:

  • 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—ISDN (001)
  • APRI—This interworking is dependent on the value of either the SIP privacy header or the priv-value presented in the History-info:
    • If the privacy header is present and contains a value other than 'none', map to restricted (01).
    • If the privacy header is absent, or present with the value 'none', map to allowed (00).
  • Screening Indicator—Network Provided (11)
  • Address Signal—P-Asserted-Id user-part