Disclosed herein is a method for indirect communication in a core network of a wireless communication system using a Service Communication Proxy, SCP, with Transport Layer Security, TLS, the method comprising: at a Network Function, NF, service consumer: sending, to the SCP, a Hypertext Transfer Protocol, HTTP, message that is intended for a first NF service producer instance, the HTTP message using a Fully Qualified Domain Name, FQDN, of the SCP and having a path that includes a query parameter set to a first value; and at the SCP: receiving the HTTP message from the NF service consumer; obtaining a HTTP response for the HTTP message; and sending the HTTP response to the NR service consumer; and at the NF service consumer: receiving the HTTP response from the SCP.