My uncle has a small cleaning business and he uses a telephone timekeeping system so he can easily keep track of employees clocking and out. He would like to be able to replace the one he's got as it's been having issues recently and it's 15 years old. He would like a Mac-based one as his current timekeeping system is running on a Windows based IBM clone. His current timekeeping system's hardware consists of a PCI card which has phone line ports on it. He would like to be able to have two phone lines for it to prevent busy signals when a lot of employees are clocking in and out. Either USB, Firewire or maybe Thunderbolt interfaces/connectors are preferable to PCI/PCIE because it they don’t require a $2500-3000 Mac Pro, and instead can be run a $600 Mac Mini. Also, the ability to receive no-show alerts by email is critical, that way my uncle can arrange for that job to be taken care of by someone else if the person who normally does that job doesn't show up.