The responder unit interfaces with ISDN PRI to support automatic voice and data call handling. It can automatically answer and generate voice calls while providing simple plug‑and‑play installation with documentation for third‑party setup. The system enables testing of public and private telecom networks and supports continuous 24/7 operation. Designed for reliability and low lifecycle cost, it delivers strong ROI. The responder unit can run multiple scenarios with different call types and maintain them for the full test duration, ensuring true end‑to‑end circuit‑switched testing capability.

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