I use Kall8.com and TollFreeForwarding.com
both are great
You can forward the numbers to any other phone number in the world (so you can just get a skype number
https://www.skype.com/en/skype-number/ and forward to that) and/or have a voicemail. It's super cheap, like $2/month for a 8XX number and per minute rates are super cheap as well
I have 100s of toll free numbers with those 2 and never had any issue
I also had a provider that could directly forward to skype without having to have a skype number, but they stopped doing that, but there are probably still some that offer that. Either way the above option works great.
There are also cheaper options where the receive installs a voip app and you route the numbers to that, but it requires a bit more technical knowledge