Question about Sine and Shtoom

Hi. I visited the repository and have looked at Sine and Shtoom. Shtoom 
seems a couple of years old and does not appear to have been brought up 
to date.

Sine appears to incorporate many parts of Shtoom. Can you advise whether 
Shtoom is inactive at this point and being replaced with Sine. Also Sine 
is MIT where Shtoom appears to be LGPL. Is it just that Shtoom has not 
been updated with the MIT license since components appear to be MIT and 
code is out of step. Is it possible to use any of the older Shtoom under 
MIT?

I am new to SIP but am hoping to experiment if nothing else. Also, can 
someone advise if there is a free service just to test a few SIP 
experiments since I am not seeking a full fledged phone service just to 
try a few SIP experiments. Many thanks.

Regards,
David