mw-registrar 
Jambonz class that handles inserting, removing, and querying the database of active sip registrations
const Registrar = require('jambonz-mw-registrar');
const registrar = new Registrar({host: '127.0.0.1', port: 6379});
// add a registration, optionally with an expires value in secs
registrar.add('daveh@drachtio.org', {
contact: '10.10.1.1',
sbcAddress: '192.168.1.1',
protocol: 'udp'
}, 40);
const registrationDetails = await registrar.query('daveh@drachtio.org');
// {"contact":"10.10.1.1","sbcAddress":"192.168.1.1","protocol":"udp"}
// get count of users for a realm
const userCount = await registrar.getCountOfUsers('drachtio.org');
// remove a user
registrar.remove('daveh@drachtio.org');