Yes, exactly what Twilio is capable of. If you need it for just your business, this can be done using simple scripts. Routing is actually the easy part. Voicemails are a bit more involved but they have you covered: https://www.twilio.com/docs/howto/voicemail
HelpScout, ZenDesk or Desk.com. HelpScout (help desk software) would be a great start – less options but even when I ran a 6 person customer support team (with over 500 emails a day), we never needed the complex features of Desk.com. Have one person create 'saved replies' to quickly answer your...
I have 12 years experience in ERP solutions like SAP and various others and get this type of question a lot from SME's. I your case you want to provide implementation services and ultimately sign a retainer support contract for 36 months. There are a few good ones out there, start with https://ww...
As is my way, I have to answer tangentially: People hate reading documentation. Essentially no one will read the quick start guide, and those who do will have poor retention. This is not just a pithy quote, but driven by years of research into cognitive psychology. You cannot provide training aro...