Digital phone services work by connecting a router equipped with software to a computer and telephone, and then connecting a USB or Ethernet cable from the computer to the router. A splitter is a part of the connection setup, separating the modem line into two lines, the first one connecting the computer and the second line continuing to the router. Internet access is essential to make digital phone service work.
Digital phone service providers use software in routers to enable computers to identify the routers over an Internet connection. When calling a nondigital phone number from a digital phone, a caller's voice transforms into an analog format from a digital format, causing voice changes. The opposite happens when a nondigital phone caller makes a call to a digital phone number.
During the calling process, the caller's Internet connection goes through the telephone line, router and modem, and then it reaches the local public phone service to connect to the call receiver. Calling a digital phone number from another digital phone service does not cause changes in voice format and results in better call quality.
Fast, stable Internet connection is required to experience quality calls when using a digital phone service, as an unstable connection leads to poor call quality. With a fast Internet speed, transforming a caller's voice from digital to analog or vice versa is also faster.