The code is written in Golang (<250 lines, <9k)
I would rather maintain control and offer SipCloak as a free service at this stage. There's already, free example code or open systems that can do SIP redirects. Also, I'm not finished with SipCloak either, although I am currently distracted with other projects. Ideally, I'd like to make the sip process completely transparent so the client is unaware of the redirection, and offer facility to make calls appear from your own domain.
Unfortunately, at the moment, my servers are down, but given the number of members here at the time of failure, no one has started using it. I think the iron grasp of telco's, the closed nature of most sip providers, and the well market propriety systems, means that services like sipcloak will not be in demand for some time yet. Nonetheless, SipCloak will be returning soon.
Thanks for your interest.