Three layers, frequently confused
When a small business starts looking at phone systems, three terms arrive at once and the sales conversations blur them together. It helps to separate them by what problem each solves.
Cloud telephony is the plumbing: business numbers, calls carried over the internet rather than a traditional line, the ability to route, record and report. IVR is the automated menu, a feature that lives inside that plumbing and exists to sort callers before a human is involved. A CRM dialer is the working surface for a sales team, where the call is placed from the customer record and its outcome lands there automatically.
You may need all three, or only two. Confusing them leads either to buying a menu you do not need or to buying calling that never connects to your customer data.