The server can affect the optical terminal, so your server voice card is directly connected to the optical terminal 2M, which means that your system should be a card-type call center service system, otherwise it should be a card-type alarm corresponding to the program-controlled switch.

It is suspected that the number of telephones on the board is increasing, the disconnection speed is slow, and there may be channel failure. In short:

1, first check whether the server has overheated hardware. If a fan is broken, it is the main cause;

2. Try to change a voice card.

3. Check whether there are too many line errors, that is, whether you connect the optical transceiver with a 75 ohm coaxial cable or a network cable. I tried to connect the network cable RJ45 or use the old type 3 cable, or look for the 1B+ 1D cable, all of which are shielded.