[curiousphil]

My company recently signed up with Intelligent Office to handle our phones. It's been over a month now and we are really pleased with their service. They are pretty flexible on what they will/can handle. I believe they are franchised and we are using the Boise, ID franchise which is the next town over from us. It's always the same three girls that answer the phones for us and they do a great job of sounding like they are right in our office. They even joined one of our Slack channels so they can check in on who is available and such for incoming calls. When I went to meet them before signing up they told me they also handle customer returns for a high end mobile phone case company out of California, so I have no doubt you could train them on your invoicing process.

Edit: Adding URL! https://www.intelligentoffice.com

[bshimmin]

Thanks for the suggestion, I'll check them out (and thanks for the other responses too)!