I need to build a cost-effective phone system that can make calls and play recorded messages to people that answer the calls. This is NOT for telemarketing.
The receivers of the calls are in multiple countries. The call receivers will most likely be using mobile phones.
Phase 1: Define the specifications of the system (including software and hardware needs if any). It is fine to recommend any service providers with an existing solution. VOIP solutions are OK.
Phase 2: Build and configure the system.
Phase 3: Test and release to production.