CHF Selection

The CHF selection can be performed through one of the following options:

  1. PCF provides one or more CHF addresses as part of the PCC rule.

  2. UDM-provided charging characteristics.

  3. NRF-based discovery.

  4. SMF locally provisioned charging characteristics.

Important

The SMF uses one of the last two options to fetch the CHF IP address and port details. The SMF initially performs NRF-based discovery to select the CHF server. If the SMF fails to identify the server, then it uses the locally provisioned charging characteristics.