Section: 13.3.4 Authentication and authorization between SEPPs
Content: Authentication and authorization between SEPPs in different PLMNs is defined in clause 13.2. 13.3.5 Authentication between SEPP and SCP Authentication between SEPP and SCP within one PLMN shall use one of the following methods: - If the PLMN uses protection at the transport layer, authentication provided by the transport layer protection solution shall be used for authentication between SEPP and SCP. - If the PLMN does not use protection at the transport layer, authentication between SEPP and SCP within one PLMN may be implicit by NDS/IP or physical security (see clause 13.1). A SCP and the SEPP shall mutually authenticate before forwarding incoming or outgoing requests.