What you need to build JsSIP

You just need to have Node.js and Git.

How to build JsSIP

Clone a copy of the main JsSIP git repository by running:

$ git clone https://github.com/versatica/JsSIP.git JsSIP
$ cd JsSIP

Install gulp-cli 4.0 globally (which provides the gulp command):

$ npm install -g gulpjs/gulp-cli#4.0

(you can also use the local gulp executable located in node_modules/.bin/gulp).

Install the Node.js dependencies:

$ npm install

Finally, run gulp dist (or just gulp) to get:

$ gulp dist

$ gulp test

If you modify lib/Grammar.pegjs then you need to recompile it:

$ gulp devel
$ gulp dist