400電話可設定虛擬分機號，當我們撥通一個設定分機號的400號碼時， 系統會提示輸入分機號，然后接通。一個400電話號碼，理論上可以設置無限多分機號，分機號的位數，最長8位。對于非集中辦公的企業，就可采用一個400電話號碼，將所有員工的手機串聯起來，每個員工的電話號碼，都可設立單獨的 分機號碼。
The virtual extension number can be set for the 400 phone. When we dial a 400 number with the extension number set, the system will prompt for the extension number and then connect it. A 400 phone number, theoretically, can be set with unlimited extension numbers. The number of extension numbers is 8 digits at most. For non centralized office enterprises, a 400 phone number can be used to connect all employees' mobile phones in series. Each employee's phone number can have a separate extension number.
400電話可設置在不同的節假日，用戶呼入電話時，聽到的歡迎語不同。如在新年呼入時，聽到"祝您新年快樂",在國 慶節的時候，聽到"祝您國慶愉快"不同歡迎語。如在非工作時間客戶呼入，則可提示"現在是非工作時間，您可在工作時間呼入"等。
400 phone can be set in different holidays. When users call in, they hear different welcome words. For example, at the time of new year's call in, I hear "wish you a happy New Year" and at the time of national day, I hear different welcome words "wish you a happy National Day". If the customer calls in during non working hours, you can prompt "it's non working hours now, you can call in during working hours" and so on.