SCA Unable To Set Up Call When B-party Has CBRT (Doc ID 2956869.1)

Last updated on AUGUST 18, 2023

Applies to:

Goal

Oracle Communications Convergent Charging Controller (OC3C) and Oracle Communications Network Charging and Control (NCC) the Session Control Agent (SCA) is a highly available and scalable Session Initiation Protocol (SIP) transparent back-to-back user
agent (B2BUA), redirect server, proxy server and registrar.

When you use SIP on UDP, by default provisional responses are sent unreliability (does not re-transmit). PRACK is a provisional acknowledgement, it is used to acknowledge SIP provisional responses like 180 Ringing, 183 Session Progress etc.

There is a known issue with the SCA implementation of PRACK if a flow contains multiple provisional responses, the Call Sequence number in the B-Leg PRACK is not being incremented correctly.

Solution

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