Well I think I have solved the problem...
After numerous attempts to isolate the unit from possible source of interference, I had the idea to
reset the base unit (disconnect and reconnect the power cable) and it seems to have worked!!!
Often the solution is the most obvious but our minds look for complications all the time!
thanks anyway
alberto
You can select the desired ringer patterns of the base unit and cordless
handsets. 4 patterns are available for each line. Your phone comes from
the factory set to pattern 1. Programming must be carried out
separately for the base unit and cordless handset(s).
Make sure that the base unit/cordless handset is in the standby mode.
Base Unit Handset
4 Enter the desired pattern using
the dialing buttons ((1) to (4)) for
each line. To move to another
line, press H or I.
• Each time you select a pattern, it
rings.
5 Press (ENTER).
• A beep sounds.
• To return to the standby mode,
press (EXIT).
1 Press (FUNCTION).
2 Press or until the arrow
points to "Ringer setting",
and press H.
3 Press or until the arrow
points to "Ringer pattern",
and press H.
• The current settings are displayed.
Ringer pattern
L1 L2 L3 L4
1 1 1 1
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