Currently, no effective mechanism exists for routing calls within a telephone network in a manner that selects the ideal path (via telephone carriers) based on and in order to provide highest audio quality. This disclosure describes techniques that utilize measured audio quality as a primary metric in determining how to route a telephone call. Call quality data is obtained from a series of automated telephone calls to multiple destinations through multiple carriers. The automated calls that include predetermined tones. On the receiving end, a second automated service listens to the tones and echoes them back. Round-trip time and tone distortion are measured. Optimal route and carrier for a call can then be selected based on the carrier that provides the best measured latency and audio quality to a set destination.
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Fratantoni, Joseph and Han, Kevin, "Call Routing Based on Latency and Quality Heuristics", Technical Disclosure Commons, (January 11, 2022)