Phone system to integrate with Zoho CRM

Phone system to integrate with Zoho CRM

I am looking for phone software that would allow my agency to do the following within Zoho CRM:

Make calls from zoho
Track calls and notes
Leave pre-recorded messages after reaching voicemail of lead

Only 2 members, so need company who will allow just 2 seats

I have looked at Ring.io, but they require 5 seats minimum.  
Cloudcall looks promising, but wanted to see if any others on the forum had any experience with this.
Thanks
Russell