The WWV phone service that reads the time and a ticking noise is great for very basic testing of VoIP outbound call flow (don't abuse it!) https://www.nist.gov

The WWV phone service that reads the time and a ticking noise is great for very basic testing of VoIP outbound call flow (don't abuse it!) https://www.nist.gov/time-distribution/radio-station-wwv/telephone-time-day-service https://www.nist.gov/time-distribution/radio-station-wwv/tel...