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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. It works as a router that relays SS7 messages between ''signaling end-points'' (SEPs) and other signaling transfer points (STPs). Typical SEPs include ''service switching points'' (SSPs) and ''service control points'' (SCPs). The STP is connected to adjacent SEPs and STPs via signaling links. Based on the address fields of the SS7 messages, the STP routes the messages to the appropriate outgoing signaling link.
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. It works as a router that relays SS7 messages between ''signaling end-points'' (SEPs) and other signaling transfer points (STPs). Typical SEPs include ''service switching points'' (SSPs) and ''service control points'' (SCPs). The STP is connected to adjacent SEPs and STPs via signaling links. Based on the address fields of the SS7 messages, the STP routes the messages to the appropriate outgoing signaling link. Edge STP
Edge STPs (signal transfer points) are networking hardware devices embedded with software that performs routing, signaling, firewall, and packet conversion functions. Their primary purpose is to unify networks that use various transports and sig ...
s can also route based upon message body content using deep packet inspection
Deep packet inspection (DPI) is a type of data processing that inspects in detail the data being sent over a computer network, and may take actions such as alerting, blocking, re-routing, or logging it accordingly. Deep packet inspection is oft ...
techniques, and can provide address translations and screen content to limit the transfer of messages with dubious content or sent from unreliable sources. To meet stringent reliability requirements, STPs are typically provisioned in mated pairs.
These 'routers' are connected just by signaling links; they do not have users attached (where a ''user'' could be a mobile station
A mobile station (MS) comprises all user equipment and software needed for communication with a mobile network.
The term refers to the global system connected to the mobile network, i.e. a mobile phone or mobile computer connected using a mobile ...
(MS), a PSTN
The public switched telephone network (PSTN) provides infrastructure and services for public telecommunication
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other el ...
user in case of a public terrestrial network, or a piece of terminal equipment In telecommunication, the term terminal equipment has the following meanings:
* Communications equipment at eithe