From VoIP.ms Wiki
Nomorobo is a cloud-based internet service that helps to block and hangs up illegal calls from telemarketers. VoIP.ms works with Nomorobo to block unsolicited robocalls to your cell phones and other devices.
In this guide, we will help you set up Nomorobo on your account.
Create a Call Forwarding
The first step, you need to create a new entry in your Call Forwarding. To do so, log on to your VoIP.ms Portal.
On the navigation bar click on “DID Numbers” and select "Call Forwarding".
You will need to add a new entry, click on "Add Forwarding".
In this part you need to enter the Nomorobo Number, retrived in your control panel, into the phone number field, then type by example "Nomorobo" in the Description Box. Finally Save your entry.
Create a Ring Group
Since your Call Forwarding has been successfully created, you need to create a Ring Group. To do so, go to the navigation bar, click on “DID Numbers” and select "Ring Group".
You will need to add a new entry, click on "Create new ring group".
In this part, you need to type for example "Nomorobo" in the Description Box, then check the box for the destination (Main Account, Sub Accounts, SIP URI's, Call Forwarding),
that you would like to add in this Ring Group, also you can specify the number of rings you want. After that, you will need to check the Nomorobo call forwarding that you just created previously and set the ring time to [10s ~ 2 rings]. Then click Create
Note: You can only select one destination with "Nomorobo Call Forwarding". If you need to protect multiple DIDs or SubAccounts with Nomorobo, you need to create a ring group for each DID, but you can use the same Nomorobo phone number in each one.
Route the Ring Group to your DID
Since your Call Forwarding and your Ring Group has been successfully created, you need to route your DID. To do so, go to the navigation bar, click on “DID Numbers” and select "Manage DID(s)".
In this part you need to select the Ring Group option then choose NOMOROBO in the drop-down menu. Then at the end of the page, save your edits by clicking on Click here to apply changes
After completing the 3 steps, return on your Nomorobo Account and go to Your Phones and click TEST next to your number. You will be able to press on I'm ready. Call Me Now.
You will receive a call without delay letting you know if everything is set up correctly. Please take the call after the third ring. Your number will now be listed as "Protected".