From VoIP.ms Wiki

Contents 1 Echo test

Echo test

In order to test your phone number - no matter if they were bought from our stock or ported in from other carriers - you can use our "Echo test" or "Sound quality test" tool. When using this tool you are routing and sending all your incoming calls from external carriers into a recording/tool that it is allocated in our server and system.

All those incoming calls won't be sent to your device, so when testing incoming calls, if you are able to reach this recording/tool all the time you dial your VoIP.ms number from external carriers, this will mean your number is working fine within our network.

We encourage suggest to test all your new phone numbers either if they were bought from our stock or ported in 
from external carriers

In order to test your phone number follow these steps:

1. Login into your customer portal and head to DID Numbers>> Manage DIDs section and click on the orange icon with a pen.