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I was going through Russell's SS7 guide and was wondering what are SSP actually . Are these the telephone boxes we see on our streets or are they present inside telephone exchanges .

Aakusti
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According to "Lan Tutorial With Glossary of Terms: A Complete Introduction to Local Area Networks (Lan Networking Library)" April, 1996:

SS7 messages originate at an SSP [Service Switching Point], which is a telephone switch that places or receives a call. The SSP is usually found at a telco's central office, but SS7 messages may also be used by an enterprise PBX. An ISDN PRI's D channel can also send messages that are compatible with SS7.

So not the little boxes, usually.

John Burger
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