Building an IVR using Bandwidth’s BXML

The text discusses the use of Bandwidth's Voice API and BXML to build Interactive Voice Response (IVR) systems. It explains how IVR systems can be built using BXML, a custom XML language that defines operations for phone calls on Bandwidth’s network. The author provides an example of building an IVR system with BXML for a plumbing service's customer satisfaction survey. The text also highlights the differences between Bandwidth's Voice API and BXML in updating phone calls and retrieving call information from Bandwidth.