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SS7 (Wire Communications)

SS7 Signaling Points, and Call Setup Sample
by

Naomi San Juan

on 4 September 2013

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Transcript of SS7 (Wire Communications)

SS7 Signaling Points ?
Signaling points

provide access to the SS7 network, access to databases used by switches inside and outside the network, and the transfer of SS7 messages to other signaling points within the network.
Service Switching Points
(sometimes called signal switching points)
are local telephone switches (in either tandem offices) equipped with SS7-compatible software and terminating signal links.
SSPs provide the functionality of communicating with the voice switch by creating the packets of original signal units necessary for transmission over the SSP network.
Signal Transfer Points
SSPs must convert signaling information from voice switches into SS7 signaling format.
are the packet switches of the SS7 network. STPs serve as routers as they receive and route incoming signaling messages to the proper destination.
Service Control Points
(sometimes called signal control points)
serve as an interface to telephone company databases.
SCPs also perform protocol conversion from SS7 to X.25, or they can provide the capability of communicating with the database directly using an interface called primitive.
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i haven't even learned my ABC yet.
i haven't even learned my ABC yet.
a kid's got enough problem in this world.
a kid's got enough problem in this world.
a kid's got enough problem in this world.
i haven't even learned my ABC yet.
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information overload!!
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i am no genius.
i am no genius.
i am no genius.
SS7 Call setup Example
Subscriber A goes of hook and touch tones out the destination telephone number of subscriber B.
The local telephone translates the tones to binary digits.
The local telephone exchange compares the digits to numbers stored in a routing table to determine whether subscriber B resides in the same local switch as subscriber A.
After the switch determines that subscriber B is served by a different local exchange, an SS7 message is sent onto the SS7 network.
When subscriber B answers the telephone, the switching path is complete.
When either subscriber A or subscriber B terminates the call by hanging up, the SS7 network releases the switching path, making the trunk circuits and switching paths available to other subscribers of the network.
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