Intelligent Network Application Part


Intelligent Network Application Part (INAP) is a telecommunication protocol used in Signaling System No. 7 (SS7) networks. It facilitates advanced call services within the Intelligent Network (IN) and enables communication between network elements, such as service switching points and service control points. INAP allows for customized and complex solutions like call routing, number translation, and billing services.


The phonetic representation of the keyword “Intelligent Network Application Part” using the International Phonetic Alphabet (IPA) would be:/ɪnˈtɛlɪdʒənt ˈnɛtwɜrk ˌæplɪˈkeɪʃən pɑrt/Here’s the breakdown:- Intelligent: /ɪnˈtɛlɪdʒənt/- Network: /ˈnɛtwɜrk/- Application: /ˌæplɪˈkeɪʃən/- Part: /pɑrt/

Key Takeaways

  1. Intelligent Network Application Part (INAP) is a signaling protocol used in telecommunications networks for the implementation and integration of advanced services such as call forwarding, toll-free numbers, and call screening.
  2. INAP operates at the application layer in the Signaling System No. 7 (SS7) protocol stack, enabling communication between service switching points (SSPs), service control points (SCPs), and intelligent peripherals (IPs) to execute and control the delivery of intelligent network services.
  3. Because of its standardized architecture and compatibility with different telecommunication networks, INAP promotes seamless interoperability, which improves network efficiency, facilitates rapid service deployment, and enables service providers to offer innovative and flexible services.


The technology term Intelligent Network Application Part (INAP) is important because it plays a crucial role in the telecommunication industry by enabling advanced, value-added services within the Intelligent Network (IN). As a part of the Signaling System No.

7 (SS7) protocol, INAP grants operators and service providers the ability to dynamically control and manage calls while offering subscribers a range of enhanced services, such as toll-free numbers, call forwarding, number portability, and call screening.

By facilitating communication between service switching points and network elements, INAP significantly improves flexibility, scalability, and performance in telecommunication networks and paves the way for robust and innovative solutions to cater to the ever-increasing telecommunications demands.


The Intelligent Network Application Part (INAP) plays a critical role in the realm of telecommunications, as it fulfills a key purpose in empowering network operators to design and integrate advanced services within their systems. This highly customizable component supports the rapid deployment of new telecommunication services while ensuring minimal interference with the existing functionality of the networks, such as billing, routing, and call processing.

Through INAP’s protocol-based architecture, network providers can develop innovative and high-value services, such as toll-free calling, prepaid calling, number portability, and call screening, which enhance customer experience and drive the industry’s competitiveness and growth. Additionally, INAP enables seamless communication among intelligent network components and simplifies the overall service creation process by homogenizing diverse network elements, making the implementation of these services much more accessible.

By fostering cross-network cooperation and interaction, INAP promotes the effective utilization of resources and facilitates the realization of complex services which would be otherwise unfeasible. Serving as a crucial cornerstone in the development of flexible and scalable intelligence networks, INAP ultimately fosters the delivery of enhanced and unparalleled telecommunication services, benefiting both operators and end-users alike.

Examples of Intelligent Network Application Part

The Intelligent Network Application Part (INAP) is a telecommunication protocol used in the implementation of Intelligent Network (IN) services in cellular networks, as well as in the integration between mobile and fixed line networks. It enables additional services and options to be offered to subscribers beyond the standard call handling functionality. Here are three real-world examples of INAP’s use in technology:

Freephone Service (Toll-Free Numbers): INAP plays a critical role in the implementation of freephone or toll-free number services, allowing customers to call businesses without being charged for the call. When a customer dials a toll-free number, INAP directs the call to an appropriate center based on factors like the geographical location, time of call, and load balancing.

Virtual Private Networks (VPNs): INAP is utilized to create advanced VPN solutions between business users and their telecommunication networks. Corporate customers can create a customized private numbering plan, implement short dial codes within their organization, and have the ability to prioritize certain calls over others. INAP is responsible for identifying the particular user in the VPN and processing the call accordingly.

Mobile Number Portability (MNP): Mobile Number Portability allows mobile subscribers to switch service providers while retaining their original phone number. INAP is essential in establishing the communication between the old and new service providers, managing the routing of calls, and providing call processing based on the new service provider’s service platforms. This ensures a seamless transition for the mobile subscriber without any disruption in their incoming calls.

Intelligent Network Application Part (INAP) FAQ

1. What is Intelligent Network Application Part (INAP)?

Intelligent Network Application Part (INAP) is a signaling protocol used in telecommunication networks. It enables advanced intelligent network features such as toll-free calling, televoting, and call forwarding by enabling the exchange of information between nodes in the telecommunication networks.

2. What are the key components of INAP?

INAP has two key components: the Service Switching Function (SSF) and the Service Control Function (SCF). The SSF resides in the network’s switching elements and performs call processing, while the SCF resides in the network’s control layer and provides service logic for various intelligent network services.

3. What are some services provided by INAP?

INAP enables a range of advanced telecommunication services, including toll-free calling, call forwarding, number portability, local number portability, and virtual private networks (VPNs), among others.

4. How does INAP work in conjunction with other network components?

INAP works together with other network components such as the Signaling System 7 (SS7) and Signaling Connection Control Part (SCCP). INAP is responsible for providing the application layer, while SS7 and SCCP provide the transport and network layers for communication between network nodes.

5. Is INAP still relevant in modern telecommunication networks?

Yes, INAP continues to be used and is even integrated with newer telecommunication technologies like IP Multimedia Subsystem (IMS). It has undergone several revisions and updates to meet the evolving needs of the telecommunication industry.

Related Technology Terms

  • Signaling System No. 7 (SS7)
  • Service Control Point (SCP)
  • Service Switching Point (SSP)
  • Basic Call State Model (BCSM)
  • Global Title Translation (GTT)

Sources for More Information


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