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The SBC Core support interacting with Policy and Charging Rule Function (PCRF) in asynchronous mode by configuring the parameter PCRF Interaction Mode  for the Sip Trunk Group. This parameter controls whether interaction with PCRF is synchronous or asynchronous. The default value of this parameter is synchronous.

  • In synchronous interaction mode, the SBC sends INVITE message to egress once it receives the response for the AAR, which is sent towards PCRF.
  • In asynchronous interaction mode, the SBCsends INVITE message to egress after sending an AAR request. SBC continues with call processing without waiting for any response from the PCRF or time-out of the transaction. The final AAR is sent after receiving the session answer even though the answer or time-out for the preliminary AAR is not received.

Figure 1: Synchronous PCRF Interaction Mode

Figure 2: Asynchronous PCRF Interaction Mode

For configuration details, refer to:

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