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Run the full check
Confirms the carrier trunks answer, the firewall permits them, phones are registered,
inbound routing resolves, audio ports are open, and no recent call had one-way audio.
Real test call
Dials the time service (423-265-1411) through Skyetel and measures whether audio comes
back. The only check that proves a call genuinely works. Runs automatically every 6 hours.