CAMEL Application Part: Difference between revisions

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{{Short description|Signalling protocol used in the Intelligent Network architecture}}

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The '''CAMEL Application Part''' ('''CAP''') is a signalling protocol used in the [[Intelligent Network]] (IN) architecture. CAP is a [[Remote Operations Service Element protocol|Remote Operations Service Element]] (ROSE) user protocol, and as such is layered on top of the [[Transaction Capabilities Application Part]] (TCAP) of the [[Signaling System 7|SS#7]] protocol suite. CAP is based on a subset of the [[European Telecommunications Standards Institute|ETSI]] Core and allows for the implementation of carrier-grade, value added services such as unified messaging, prepaid, fraud control and Freephone in both the [[GSM]] voice and [[GPRS]] data networks. [[Customized Application of Mobile Enhanced Logic|CAMEL]] is a means of adding intelligent applications to mobile (rather than fixed) networks. It builds upon established practices in the fixed line telephony business that are generally classed under the heading of (Intelligent Network Application Part) or [[INAP]] CS-2 protocol.<ref name="29.078">[http://www.3gpp.org/ftp/Specs/html-info/29078.htm 3GPP TS 29.078] - The 3GPP specification for CAP</ref>

==Protocol specification==

The CAMEL Application Part (CAP) portable, software provides mechanisms to support operator services beyond the standard GSM services for subscribers roaming within or outside the Home [[PLMN]] (HPLMN). The CAP product extends the IN framework to the GSM/3G networks for implementing IN-based services within GSM/3G networks.

CAMEL is used when the subscriber is roaming between networks, allowing the home network to monitor and control calls made by the subscriber. CAMEL provides services such as prepaid roaming services, fraud control, special numbers (e.g., 123 for voicemail that works everywhere) and closed user groups (e.g., office extension numbers that work everywhere).