If you own a SIP device, either SIP phone or SIP ATA is OK, which connect to your company's IPPBX or ITSP's SIP server, and sometimes you want to get cheaper and better calls through Skype or your customers is only available on Skype, in this case you must use earphone or USB phone to make or receive Skype calls. With SiSky Personal Edition, an IP phone is enough to meet your demand. A neatly tabletop will do a greatly convenience to your work.
SiSkyPE is a Windows-based software-only application for personal SIP device users. It forwards Skype calls to their existing IP phone.