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

Last updated on AUGUST 18, 2023

Applies to:

Oracle Communications Convergent Charging Controller - Version and later
Oracle Communications Network Charging and Control - Version and later
Information in this document applies to any platform.


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.

PRACK is defined in RFC 3262: Reliability of Provisional Responses in the Session Initiation Protocol (SIP)


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.



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