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When Two Numbers Call Each Other: The Technical Mechanics of Telephony Loops and Call Routing in 2026

"The phrase "two numbers call each other" typically describes a technical loop, a configuration error, or an automated test scenario where two telephone lines or virtual extensions engage in a continuous reciprocal dialing cycle. In modern telecommunications infrastructure as of 2026, understanding how numbers interact, route through Session Border Controllers (SBCs), and trigger carrier-level loop detection safeguards is essential for maintaining reliable voice networks. The Anatomy of a Telephony Loop A telephony loop occurs when two distinct telephone numbers—whether traditional Public Switched Telephone Network (PSTN) lines, VoIP extension..."

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