We have a 412 and a 406 side by side connected through the PRI modules using a crossover cable(TX-RX). They are using Qsig networking (no compression modules). The 406 uses the trunks (isdn 30) connected to the 412 to dial out. when you dial out, or recieve calls on the 406 there is a popping noise in the backround, it only happens over the Qsig connection.
Red Flag Submitted
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