This series is about a group of 5 voluntary people in their early 20's who operate a callcentre where teenagers can call to to talk about their problems at school, with their parents or even personal issues.
While there, the main characters have nothing on their hands since there aren't many phone calls except from an 'annoying kid' making pranks. During this boring time, the 5 engage in discussions on various subjects, letting their mind and fantasies run wild which in turn are visualized on screen by hilarious sketches. Also, every episode had one or more themes on which the story was based.
Although the series ran for only 2 years, it was top quality most of the time as far as I can remember since the series is over 10 years old already. Even the last episode, set 10 year in the future showing the characters in 'old style' looking back on their 'last day' together, was done very well.
All in all, a great series which they should release on DVD so you can see the episodes whenever you want. Too bad there isn't a series like this on TV anymore.