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Voice Feature Guide 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).



When a phone is in the offhook state, the terminal generates an onhook signal for a period.


To generate hookflash, you can quickly press the hookflash button or R (generally) on an ordinary phone.


During a call, the user wants to start some new services. For example, the call forwarding service: user A calls user B. During the call, user B presses the hookflash button and hears the special dial tone. User B dials the number of user C and communicates with user C. User B hangs up the phone, and then user A communicates with user C.

Hookflash Signal

Hookflash is short-time phone onhook actually. However, onhook signals last only a short period of time and therefore hookflash cannot be determined as phone onhook. Both upper and lower thresholds for hookflash are set in the system. When the last duration of an onhook signal is within the range between the upper and lower thresholds, the onhook signal is determined as the hookflash signal.

Upper and lower thresholds for hookflash are defined differently in countries. For example, in China, the upper threshold is 350 ms and lower threshold is 100 ms. This indicates that if an onhook signal lasts 100-350 ms, it is determined as a hookflash signal.

Updated: 2019-02-22

Document ID: EDOC1100067358

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