This is a PCI bus 16-channel digital line recording card produced by Sanhui Information Engineering Co., Ltd. This recording card is specially used for parallel recording of digital telephone user lines (extension lines). It supports high-resistance parallel recording of digital telephone lines, multiple ways to stop/start recording, supports 16 channels of simultaneous recording, different channels can simultaneously perform recordings in different formats, supports unidirectional recording or up and down mixed recording on each channel, supports receiving the caller and callee numbers, and synchronizing the display content of the phone during recording, user telephone key reception, call/mute detection, recording operation supports automatic gain control (AGC), call process monitoring, automatic detection of the business module and quantity installed on the main board, and supports recording card or digital telephone line break fault detection