The best thing about this software is that it offers many features to its customers which are very useful in business sector, especially with regard to softswitches.
It has some drawbacks as well but nothing serious at all. I would recommend using SIPPY SWITCHES because of their reliability, ease of use, cost effectiveness etc., they also have customer support department who help you out whenever needed. We used sip switches while working remotely from our home office so we could easily connect clients over IP phones without any hassle.