One of the least used features of Skype is its ability to register simultaneous from multiple locations. By contrast other VoIP software allows only one registration at a time. Although this feature may say nothing to a home user, a small call-center business can make use of it by implementing the call-center business on top of Skype.
The setup required to implement the call-center is minimum and basically consists only in registering Skype with the same user name from multiple computers. From this point on the call-center functions as expected, having features found only in more expensive setups.
When user calls in, all available support Skype installations begin to ring. In this moment any available customer representative may take the call. Successive calls ring only the remaining support team members.