So, I figured it must have been a problem with my handset (a CyberPhone K, Model: v652skMLR), since I couldn't hear it at all. I did a little test, recording a few second using Windows Sound Recorder, but found that there was no clicking at all! In fact, the sound quality was great!
It seems that the problem only seems to occur with Skype. I also thought that it might have had something to do with the phone being connected via a USB hub, but the problem persisted even when directly connected.
Upgrading to the 2.6 beta seems to have made some improvement. I've been asking people on both SkypeIn & Out calls if they can hear the clicking and some have said they could not hear it at all, whereas others say that it is still there, but a little fainter.
I also use the VoIPVoice Integration software (1.53) for the phone, so that I am able to use its full functionality.
Does anyone have an idea what the problem could be? Have you experienced this yourself?
Many thanks in advance!