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Is there any noise on your phone calls? Dial 17070 and select option 2, there should be no noise between the announcements.
A noisy phone line is the most common cause of disconnections. This cannot normally be detected by the BT line test.
Hello. I did the test and no noise. The voice said fine line test.
Are you sure as the announcement normally only says quiet line test. Did you use a corded phone
have you tried using test socket with a filter?
XNormally with cordless phone you get a dull hum on quiet line test
are you using test socket with a filter to see if that helps
If it starts to drop again then try test socket by removing fron of 5c and test socket is now visible