External incoming call interception device and method based on Bluetooth HFP protocol

Abstract

The invention relates to an external incoming call interception device and method based on a Bluetooth HFP (Hands-Free Profile) protocol, and is suitable for mobile terminals such as iOS, iPadOS, Android and the like. The equipment comprises a power supply module, a Bluetooth HFP communication module, a rule storage module and a control module, wherein the power supply module takes electricity through a USB-A interface, a USB-C interface or a Lightning interface and drives the equipment to start after being electrified; the Bluetooth HFP communication module establishes protocol connection with a mobile terminal and receives an incoming call signaling; the rule storage module is used for storing a peripheral local rule and fusing the peripheral local rule with a mobile terminal local rule and a cloud rule to generate a unified rule table; when the control module receives an incoming call signaling, a mobile terminal rule is called to execute first-stage interception, if the first-stage interception is not carried out, second-stage comparison is carried out according to a peripheral local rule, and a hang-up instruction is sent to the terminal through an HFP protocol link. The method supports multi-source rule fusion, dual-stage interception and plug-and-play operation, and the crank call interception success rate can be remarkably improved in the environment that the authority of a mobile operating system is limited.

Description

Technical Field

[0001] This invention relates to the field of communication technology, specifically to an external call interception device and method based on the Bluetooth HFP (Hands-Free Profile) protocol, applicable to mobile terminals such as iOS, iPadOS, and Android. Background Technology

[0002] The current iOS system has significant limitations in call blocking, and third-party applications cannot achieve complete call blocking, resulting in a low rate of blocking spam calls. Although some Bluetooth-based peripherals can provide call notifications or simple filtering, they usually rely on the real-time operation of the mobile device management program. Once the connection is lost or the application is closed, the blocking function will fail.

[0003] Furthermore, existing devices rely on a single source of interception rules, lacking multi-stage judgment and multi-source fusion mechanisms, resulting in insufficient interception accuracy and flexibility. Most existing Bluetooth peripherals are auxiliary devices such as in-vehicle systems or Bluetooth headsets, not specifically designed for call interception, and they also have limitations in structure, function, and operating mode.

[0004] Therefore, there is an urgent need for an external call blocking device that can operate independently, has multi-source rule fusion and a two-stage blocking mechanism, in order to improve the blocking effect of harassing calls and support plug-and-play functionality in multiple scenarios. Summary of the Invention

[0005] This invention provides an external call blocking device and method based on the Bluetooth HFP protocol. The device can be powered on from any power interface and can operate independently without management applications after initial pairing with a mobile terminal. By integrating local terminal rules, cloud rules, and external device rules, and employing a two-stage blocking mechanism, it achieves efficient cross-platform blocking.

[0006] 1. Two-stage interception mechanism: Stage 1: The mobile terminal judges and executes the interception based on local rules and cloud rules. Stage 2: If the terminal does not intercept, the peripheral device obtains the incoming call information through the HFP protocol and judges it according to the peripheral device's local rules. If necessary, it directly sends a hang-up command to the terminal. Interception priority: Terminal interception > Peripheral device interception.

[0007] 2. Plug and play, and operate independently. Supports multiple power supply methods such as USB-A, USB-C, and Lightning, and starts up immediately upon power-on. After configuration, the peripheral can still independently perform the second-stage interception even if the management application is closed.

[0008] 3. Multi-source rule fusion: Merge terminal local rules, cloud rules, and peripheral device local rules into a unified rule set to improve cross-platform interception accuracy and adaptability.

[0009] 4. Extended functional module: Harassment detection based on speech recognition 5. Cross-platform compatibility, supporting operating systems such as iOS, iPadOS, and Android, while maintaining consistent interception logic and priority strategies.

[0010] Compared with existing technologies, this invention can achieve two-stage interception, increasing the harassment call interception rate from 40%~60% to over 80%; the peripheral device of this invention is plug-and-play and can operate independently without management applications, avoiding the defects of existing technologies that rely on apps. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the specific implementation methods of the present invention will be further described below with reference to the accompanying drawings. Obviously, the accompanying drawings are for illustrative purposes only and do not constitute a limitation on the scope of protection of the present invention.

[0012] Figure 1: Schematic diagram of the system structure of the external call interception device of the present invention Figure 2: Hardware block diagram of the external call interception device of the present invention Figure 3: Schematic diagram of the two-stage interception process of the present invention Figure 4: Schematic diagram of multi-source rule fusion in this invention Figure 5: Schematic diagram of multiple power supply methods for the external device of the present invention Detailed Implementation

[0013] Example 1 This embodiment provides an external call interception device based on the Bluetooth HFP protocol, including a power supply module, a Bluetooth HFP communication module, a rule storage module, and a control module.

[0014] The power supply module uses a USB Type-C interface with an input voltage of 5V and has a built-in power management chip to stably output a 3.3V operating voltage and drive the main control chip.

[0015] The Bluetooth HFP communication module is based on the Bluetooth 5.0 protocol stack and supports HFP version 1.7. It can receive incoming call number information from mobile terminals via the AT+CLIP command and execute hang-up operations via the AT+CHUP command.

[0016] The rule storage module uses an on-chip Flash memory with a capacity of 16MB to store the local blacklist number database and supports synchronous updates with the mobile terminal via a BLE link.

[0017] The control module is implemented by a 32-bit low-power microcontroller (such as an ESP32 series chip). When an incoming telegram is received, it calls the terminal rules and local rules according to a preset priority for comparison, and sends a hang-up command to the Bluetooth HFP communication module when the conditions are met.

[0018] Example 2

[0019] The call blocking method provided in this embodiment includes the following steps: Power-on startup: After the peripheral device is plugged into the USB interface, the power management circuit detects that the voltage is stable and starts the Bluetooth module.

[0020] Establishing a connection: The peripheral Bluetooth module establishes an HFP protocol link with the mobile terminal through the pairing process.

[0021] Phase 1 interception: When the terminal detects an incoming call, it calls local rules and cloud rules to compare the number, and hangs up directly if the number matches the rules.

[0022] Second-stage interception: If the terminal does not hang up, the peripheral device obtains the incoming call number through the AT+CLIP command and compares it with local rules. If a rule is matched, the peripheral device sends the AT+CHUP command to the terminal to hang up.

[0023] Rule Update: External settings periodically establish a connection with the cloud server, download the latest rule library, and merge it with the local rules on the terminal to generate a unified rule table.

[0024] This method can still achieve efficient two-stage interception even in environments where terminal API permissions are restricted.

Claims

1. An external call interception device based on the Bluetooth HFP protocol, characterized in that, include: The power supply module is configured to obtain power through USB-A, USB-C, and Lightning interfaces, and drive the device into working state when the power is connected; The Bluetooth HFP communication module is configured to establish an HFP protocol connection with the mobile terminal and receive the corresponding incoming call command when the mobile terminal generates an incoming call. The rule storage module is configured to store local interception rules for external devices and integrate them with local rules on mobile terminals and rules downloaded from the cloud to generate a unified rule table; The control module is configured to perform an interception operation upon receiving the incoming telegram, following these steps: (1) The mobile terminal is invoked to perform the first-stage interception based on local rules and cloud rules; (2) When the mobile terminal does not perform interception, a second-stage comparison is performed according to the local rules of the peripheral device, and when the matching result meets the preset conditions, a hang-up command is sent to the mobile terminal through the Bluetooth HFP protocol link.

2. The device according to claim 1, characterized in that, When performing the second-stage interception, the control module directly generates and sends a hang-up command via the HFP protocol link using AT commands or equivalent control signaling, without needing to call the user interface related interfaces of the mobile terminal.

3. The device according to claim 1, characterized in that, The rule storage module combines multi-source rules into a unified rule table using a preset fusion algorithm, and performs matching according to the following priority: terminal whitelist > terminal blacklist > peripheral blacklist > default allow.

4. The device according to claim 1, characterized in that, The rule storage module includes: a version detection unit, used to generate an update trigger signal when a rule version difference is detected; and a rule update unit, used to perform rule synchronization according to a preset update strategy, the strategy including timed updates and on-demand updates.

5. The device according to claim 1, characterized in that, The power supply module supports power supply via USB-A, USB-C, and Lightning interfaces, and automatically drives the Bluetooth HFP communication module and control module into the initialization state after detecting that the power supply voltage is stable.

6. The device according to claim 1, characterized in that, The Bluetooth HFP communication module is configured to establish an HFP protocol connection with mobile terminals running iOS, Android, or iPadOS operating systems, and to invoke a unified two-stage interception logic under different operating systems.

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