The new and improved python3 version is here!
Because as we all know, python2 is the work of the devil, a major contributor to global warming
and is probably responsible for the death of Jesus.

Installing.

Find a nice place to put the file 'sipproxy', preferrably in a directory of its own.
cd to that directory in a terminal/console/xterm and invoke the program by typing ./sipproxy
It is purposely verbose, and will display a running commentary on what is happening. 
During this first run, the config file will be created as conf/config.conf and the phone book 
will be created as conf/addressbook.conf; (Both of these files require editing, and a great 
deal of effort has been put into using the right number words to enable the user to understand 
what is required, without competing with 'War & Peace').

Note:

Microsoft Windows users will need to affix a '.py' file extension on to 'sipproxy', because
Windows uses the file extension to determine the action required to use the file. Linux does 
not require a file extension, relying instead on file execute permissions and the shebang line
(#!/usr/bin/python or #!/usr/bin/env python).