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11. Common exceptions
1. Extension has no dialing tone after off-hook.
Replace the phone line and try again.
Replace the phone and try again.
Check whether there are any unconnected exterior ports in the open state, and the
off-hook mode is exterior line.
2. Extension does not ring
Try again after changing the phone.
Try again after changing the extension port.
Try again after changing the phone line.
3. A busy tone is heard when the extension is called.
Whether the called extension is on-hook.
Whether the wrong number is dialed.
Whether the called extension number exists.
4. Outside caller call extension, hearing busy tone after answer the call.
Check the telephone line of the called extension, and check whether there is any
skin leakage.
Check whether the hook of the called extension is damaged.
5. Internal talking and outside talking all have very big noise.
Check whether the modular plug of the telephone line is in poor contact.
Check whether it passes through induction cooker, high-power transformer and
other strong electromagnetic equipment around the PBX or on the way of wiring.
6. Sometimes there is noise on the outside talking, sometimes no.
Use the specified exterior line to outgoing call, select the specified exterior line
to talk in turn, confirm the failure of exterior line, and check whether the modular plug
is in bad contact (rust, falling off, etc.).
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