P.5 Co-existence of PANI-aware and other P‑CSCFs

33.2033G Security3GPPAccess security for IP-based servicesTS

This section introduces a configuration-based solution, which enables an S‑CSCF to serve both PANI-aware P‑CSCFs and P‑CSCFs that are not PANI-aware.

Configuration-based solution:

The S‑CSCF shall be configured in such a way that it knows which P‑CSCFs are PANI-aware, according to section P.3. The S‑CSCF knows the P‑CSCF which forwarded the registration request from the Via header.

NOTE: Both GIBA and NBA require the P‑CSCF to be in the home network. This may help in realising the configuration-based solution.