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Signalling System No. 7 (SS7) is a set of telephony signaling protocols developed in the 1970s that is used to setup and teardown telephone calls on most parts of the global public switched telephone network (PSTN).
An SS7 point code is an address for the SS7 telephone switching system. It is similar to an IP address in an IP network. It is a unique address for a node (Signaling Point, or SP), used in MTP layer 3 to identify the destination of a message signal unit (MSU).
The Message Transfer Part (MTP) is part of the Signaling System 7 (SS7) used for communication in Public Switched Telephone Networks. MTP is responsible for reliable, unduplicated and in-sequence transport of SS7 messages between communication partners. MTP is formally defined primarily in ITU-T recommendations Q.701, Q.702, Q.703, Q.704 and Q.705.
Answer message (ANM) — Sent when the subscriber picks up the phone, a resource is connected or answer supervision is returned by an interworking point. Normally charging starts at this moment. It is required that the call be cut through in both directions by this point. Connect (CON) — Sent when the call is answered by an automatic terminal.
A Signal Transfer Point (STP) is a node in an SS7 network that routes signaling messages based on their destination point code in the SS7 network. [1] It works as a router that relays SS7 messages between signaling end-points (SEPs) and other signaling transfer points (STPs).
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SS7 network structure; SEPs are labeled SSP and SCP. In telecommunications, a Signaling End Point (SEP) is an SS7 endpoint. [1] This is to be contrasted with a Signal Transfer Point (STP). [2] Examples include: Intelligent Network components such as Service Control Points (SCPs) and Service Switching Points (SSPs)
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