- P-Asserted-Identity: S-CSCF2 inserts the TEL URI of the user in the P-Asserted-Identity header field.
- P-Charging-Vector: S-CSCF2 adds the identifier of its own network to the terminating Inter Operator Identifier (IOI) parameter of this header and puts back the originating IOI parameter.
- P-Charging-Function-Addresses: S-CSCF2 passes this header to I-CSCF2 for charging.