ISUP Generic Number Field for Corporate Call Separation
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Solution Overview
Problem
In mobile communication networks, especially for corporate users, there is a need to display a different number on called terminals instead of the default subscriber identification number, but existing solutions are complex and expensive, or they exceed standard limitations, leading to issues like 'number suppressed' messages and incorrect call categorization.
Innovation Solution
A method and arrangement that allow predefined information to be transmitted during mobile radio connection setup using the CAMEL protocol, where a service authorization enables the transmission of alternative numbers, such as a company's landline number, by using the Generic Number field in ISUP signaling messages, even if the user lacks specific service permissions, by routing through a service center or SIM card storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the caller's assigned telephone number is transmitted to the called terminal, then the called party can see the actual caller number, but corporate users cannot separate professional and private calls and may be disturbed in free time
Solution Approach 1:
The invention segments the telephone number transmission by introducing a separate information field (Generic Number field in ISUP signaling) that can carry alternative number information distinct from the caller's assigned number. This allows the network to transmit different number information for professional calls versus private calls, enabling corporate users to separate these call types and control when they are disturbed.
2Adaptability or versatility
If a different number is transmitted instead of the caller's assigned number, then corporate call management is improved, but standard communication protocols are violated and interoperability is compromised
Solution Approach 1:
The invention utilizes the Generic Number field in ISUP signaling messages, which is a standardized field already defined in communication protocols. By using this existing multi-functional field for its intended purpose of carrying alternative number information, the solution achieves call management flexibility while maintaining protocol compliance and network interoperability.
3Ease of operation
If the number transmission is completely suppressed, then private calls are protected, but the called party sees 'number suppressed' and may refuse to accept calls
Solution Approach 1:
The invention introduces an intermediary information field (Generic Number field) that mediates between the need for privacy and the need for call acceptance. Instead of completely suppressing the number transmission, this intermediary field carries alternative number information (such as a company landline number) that allows the called party to identify and accept professional calls while the user's private mobile number remains protected.
4Adaptability or versatility
If existing solutions are implemented to transmit alternative numbers, then call management is improved, but the solutions are complex and expensive
Solution Approach 1:
The invention enables the network elements (switching centers, signaling systems) to automatically handle alternative number transmission using existing standardized protocols and fields. The system self-configures to use the Generic Number field in ISUP messages without requiring complex additional infrastructure or expensive proprietary solutions, thereby reducing network complexity while maintaining alternative number transmission capability.
Data Source
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AI summary
The invention relates to a method and an arrangement for transmitting predefined information (INFO) during the establishment of a mobile communication connection from a mobile communication terminal (MS) of a customer of a mobile network operator to a called terminal, wherein the customer has a subscriber identification module (SIM) to which at least one subscriber identification number (IMSI) is assigned, wherein each subscriber identification number is assigned a telephone number (MSISDN), wherein each telephone number is assigned a subscriber profile, wherein one of the subscriber profiles contains a service authorization (O-CSI) to participate in certain additional services, and wherein the call establishment is carried out using an ISUP signaling message with a generic number field.The method according to the invention is characterized in that the information to be transmitted to the called terminal device is stored in a storage device (SIM; DB), that, given predefinable boundary conditions, said information is read from the storage device and entered into the Generic Number field of the ISUP signaling message, and that said information is output on an output device of the called terminal device.