INAP stands for Intelligent Network Application Protocol or Intelligent Network Application Part. It is the signalling protocol used in

Intelligent Network The Intelligent Network (IN) is the standard network architecture specified in the ITU-T Q.1200 series recommendations. It is intended for fixed as well as mobile telecom networks. It allows operators to differentiate themselves by providing ...

ing (IN). It is part of the

Signalling System No. 7 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). The protocol also performs ...

(SS7) protocol suite, typically layered on top of the Transaction Capabilities Application Part (TCAP). It can also be termed as logic for controlling telecommunication services migrated from traditional switching points to computer based service independent platform.
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Applications

The

International Telecommunication Union The International Telecommunication Union (ITU)In the other common languages of the ITU: * * is a list of specialized agencies of the United Nations, specialized agency of the United Nations responsible for many matters related to information ...

(ITU) defines several "capability levels" for this protocol, starting with Capability Set 1 (CS-1).{{cite web , url=https://www.informit.com/library/content.aspx?b=Signaling_System_No_7&seqNum=107 , title=Signaling System No. 7 | Intelligent Network Application Protocol (INAP) , publisher=InformIT , date=2008-07-18 , accessdate=2014-02-26 , archive-url=https://web.archive.org/web/20140304220101/https://www.informit.com/library/content.aspx?b=Signaling_System_No_7&seqNum=107 , archive-date=2014-03-04 , url-status=dead A typical application for the IN is a Number Translation service. For example, in the United Kingdom, 0800 numbers are freephone numbers and are translated to a geographic number using an IN platform. The Telephone exchanges decode the 0800 numbers to an IN trigger and the exchange connects to the IN. The telephone exchange uses Transaction Capabilities Application Part (TCAP), Signaling Connection and Control Part (SCCP) and INAP and in IN terms is a service switching point (SSP). It sends an INAP Initial Detection Point (IDP) message to the service control point (SCP). The SCP returns an INAP Connect message, which contains a geographic number to forward the call to. INAP messages are defined using

ASN.1 Abstract Syntax Notation One (ASN.1) is a standard interface description language (IDL) for defining data structures that can be serialized and deserialized in a cross-platform way. It is broadly used in telecommunications and computer networ ...

encoding. SCCP is used for the routing. Extended form of INAP is

Customised Applications for Mobile networks Enhanced Logic Customized Applications for Mobile networks Enhanced Logic (CAMEL) is a set of standards designed to work on either a Network Switching Subsystem, GSM core network or the Universal Mobile Telecommunications System (UMTS) network(4g+LTE.+cGHsa+. The ...

(CAMEL). TCAP is used to separate the transactions into discrete units.

References

Signaling System 7 Application layer protocols