Method and apparatus for p-cscf restoration and p-cscf information registration

A method performed by a first network repository function (NRF), comprising:

• receiving a register request comprising a profile of a proxy call session control function (P-CSCF) from the P-CSCF, wherein the profile comprises address information of the P-CSCF for an Mw interface and address information of the P-CSCF for a Gm interface;
• storing the profile of the P-CSCF;
• and
• sending a register response to the P-CSCF.

A network function (NF), comprising:

• a processor;
• and
• a memory coupled to the processor, said memory containing instructions executable by said processor, whereby said NF is operative to:
• receive a discovery response message from a network repository function (NRF) indicating a NF profile information of at least one P-CSCF,
• wherein the NF profile information of the at least one P-CSCF comprises respective address information of the at least one P-CSCF for respective Mw interface and respective address information of the at least one P-CSCF for respective Gm interface.