1. If you want to know the current external port number, just press ##3+(0 1)(02) on any phone connected to the switch ... After listening to the dial tone, dial your mobile phone number to talk, you can detect the problematic port number and rule out whether there is a problem with the external port.
Note: 0 1. Represents the first port of an external line. 02 represents the second port of the outside line. And so on.
2. If you want to know the current extension (extension number) and (port number), please press:
##6* (Automatically broadcast the current extension number)
##60 (Automatically broadcast the current extension number)
Note: The above is the most authoritative operation method. If you want to eliminate the cause of the noise problem, you'd better first eliminate the expansion ports and external ports that have problems at present. Generally speaking, the noise problem is mainly due to the possibility of external crosstalk. If there is noise inside, the problem of extension cord is not ruled out. You can simply unplug the external line from the extension of the switch first, and then try to plug it into the ordinary extension to see if there is any problem with the external line itself.
If there is no problem with the perimeter, then press the first method to detect whether there is a problem with the perimeter port, press ##30 1 on the ordinary extension to detect the first perimeter, grab the perimeter, call your mobile phone, and then talk to see if there is noise. Then ##302 detects in turn.
Finally, if there is no problem with the external line and the external port, try to detect the noisy extension. Similarly, first find out the problematic extension, and then find out the noisy extension port through the self-reported extension port. Then connect the phone directly to the faulty extension port of the switch, and then call to see if there is any noise. If not, it means there is something wrong with your line, or the line is broken, causing noise. If I wish I could help you.
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