When callers dial either extension number and leave a voice message for the user, the voice message will be delivered to the same UM-enabled mailbox.是什么意思_When callers dial either extension number and leave a voice message for the user, the voice message will be delivered to the same UM-enabled mailbox.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句