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Hi - I checked all the handsets and found I had two registered as no 2, 1 as 3 and 1 as 4 - NO No 1! I don't know how this happened but anyway I changed the duplicate no 2 to be no 1 and then re-registered the offending handset no 4. All is now fine. The duplicate number may have had nothing to do with the problem of course as unfortunately I didn't try re-registering the offending handset beforehand.