Go to the “Administrators” tab and click on the "Inbound Call Settings" . 

Choose "Inbound Bridge," then "Add Inbound Bridge". We charge $1.95 per month for the bridge and a half-cent per minute for calls. 

Give the bridge a descriptive name 

Select the bill to person (usually the account admin) and choose a destination. 

Click on "Save and Exit" 

Open the newly created inbound bridge app and make a note of its SIP address (in my case its testbridge@example.onsip.com).

Log into your Flowroute manage account and go to 'Interconnection' on the left, followed by 'Inbound Routes' at the top. 

Under 'Add New Route', add a memorable alias for 'Alias for Route', use the dropdown that reads 'Host' to change the route to 'URI', and in 'Enter SIP URI', put in the SIP Address from your newly created OnSIP Inbound Bridge, adding a 'sip:' at the beginning. 

Hit        to save the new route; it should appear now in your list of inbound routes: 
 
 

Finally, to start routing DIDs to this URI; go to 'DIDs' on the left, check the boxes next to the DIDs you'd like to route to your OnSIP Inbound Bridge using this URI, and click 'Choose a DID Action' at the top 

Choose 'Set Route', then click the orange 'Apply Action' button to the right 

Click the 'Search for a route...' box on the next page and a dropdown containing all your inbound routes will appear. If you have a large number of routes, you can type a few letters of the route or alias to filter for it. Once you've found the route with this URI and selected it, click the green 'Set Route' button in the lower right. 

Log into your account. 

Click the DID Numbers link on the top right OR on the left of the screen, select Country and your Phone Number, save. 

Click on Trunks on the left side of screen 

Fill in / select the following information then, submit: