The scope of the document doesn’t appear include end users connections, only international and network operator to network operator interfaces.
The document is a test specification, not a requirements document.
The document only applies is certain optional services (TIR) are contracted.
Although it refers to P-Asserted-ID, that is not the preferred method of providing connected line ID. I think the P- means a private use, non-standard, header. Remote-Party-ID is the current preferred method.
It appears to me that SE 23 isn’t about sending PAI, but about the circumstances under which it will not be sent,
Asterisk does have support for honouring presentation restrictions, but, off the top of my head, I can’t tell whether they completely support the scenarios in that document.
This is the first time anyone has ever asked about conformance to that document.
Support for RPID and PAI is not a requirement for SIP user agents.