RxSIPPriorityLevel sets the Priority-Level attribute value in Allocation-Retention-Priority attribute for PCC rules installed for AF SIP flows. If 0 or unset, no AllocationRetention-Priority is added in PCC rules. Otherwise Allocation-Retention-Priority is added with Pre-emption-Capability and -Vulnerability set to PRE-EMPTION_CAPABILITY_ENABLED and PRE-EMPTION_VULNERABILITY_DISABLED, respectively. There is no default.