The sofia-sip port is very outdated. Upstream is dormant and points at

https://github.com/freeswitch/sofia-sip

which has seen many releases in the last dozen years.

There never has been a consumer of the library that I can find, so I
guess the bundled utilities may have been of some use at some point.

I suggest we remove the port, or else someone who cares about it should
update it to a more recent version.