name: SS7-SEG
full_form: SS7 security gateway
context: In a PLMN that employs SS7-SEGs all TCAP user signalling messages entering or leaving the PLMN have to transit an SS7-SEG which belongs to the PLMN and which performs the protection of outgoing messages and the protection checking and de-protection or blocking of incoming messages. SS7-SEG shall do Global Title Translation. For all unprotected messages from network elements inside one PLMN that are destined for another PLMN, the destination point is a SS7-SEG of the originating PLMN. After the messages are protected by a SS7-SEG of the originating PLMN, this SS7-SEG shall direct the message towards the destination NE (cf. figure 4.2-1). One or several SS7-SEGs may be employed within a PLMN. An SS7-SEG may be co-located with any TCAP user NE or it may stand alone. However, for the purpose of this specification and without imposing any restrictions, it is assumed that the SS7-SEG is stand alone. It is further assumed that the SS7-SEGs are located at the border of the PLMN i.e. incoming
description: The SS7 Security Gateway (SS7-SEG) protects SS7 messages entering or leaving a Public Land Mobile Network (PLMN). It safeguards outgoing messages, checks protection on incoming messages, and either de-protects them or blocks them. Additionally, it performs Global Title Translation.
explanation: The text describes the SS7-SEG as a component within a PLMN responsible for securing SS7 messages through various functions like protection, checking, and translation. This clearly defines its role as a Network Function.
section_title: 4.2.2	End-to-end architecture
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