1. Configuration Guide
  2. SIP Signaling Services
  3. SIP SIP-I Interworking
  4. In-Band Announcement Indication

In-Band Announcement Indication

You can configure the SBC to add the Event Indicator parameter with value "progress" while generating a CPG by enabling the applicable iwf-for-183 parameter.

When enabled, the SBC performs this function if the received "183 Session Progress" message either:

  • Doesn't contain a PEM header, or
  • Contains a PEM with the value inactive or recvonly

The SBC adds the OBCI parameter to the generated ACM if it receives a 180 or 183 message with a PEM header with value sendonly or sendrecv. The SBC always performs this interworking for 180 messages. For 183 messages, you must have also set the iwf-for-183 parameter to enabled or pem-controlled.