TO Setup the GroundWire app on mobile devices, you will need your GEN Voice endpoint, usually something like ip4-1234.gen.network and a port number like 5099. 

Make sure you have increased max_contacts for your endpoint/extension as this will take up a second registration. 

Add the account

Add a new account, and select "General SIP Account"

Then configure your extension/endpoint in Username, Your extension/endpoint password, and for domain use the combination of your voice endpoint and port as shown below. 

Next you'll need to open advanced configuration from the bottom of this page and set the outgoing proxy, and protocols as shown below:

and a little further down you may want to select TCP

Then click DONE, and then SAVE on the previous page. This will now register with your voice switch and you will have remote voice over SIP. 

Post Setup

Groundwire is a comprehensive software with many features, so it's worth taking some time to familiarise yourself with those.