Editing INAP (section)

==Applications==
The [[International Telecommunication Union]] (ITU) defines several "capability levels" for this protocol, starting with Capability Set 1 (CS-1).<ref>{{cite web |url=https://www.informit.com/library/content.aspx?b=Signaling_System_No_7&seqNum=107 |title=Signaling System No. 7 &#124; 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 }}</ref> 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 (telephony)|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 [[Abstract Syntax Notation One|ASN.1]] encoding. SCCP is used for the routing. Extended form of INAP is [[Customised Applications for Mobile networks Enhanced Logic]] (CAMEL). TCAP is used to separate the transactions into discrete units.