Phone service companies for multiple numbers

[William Allen]

What is everyone using for multiple phone numbers ringing to the same phone to track your marketing.  I want to have multiple users able to answer the same phone call, some customer service, be able to send voicemail audio files to podio (will probably require another system and I will work on that.  I am looking at vumber and ring central right now but there are a ton out there.  Who is successful with what systems?  I searched for a while but may have been putting in the wrong keywords.  Thanks!