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Signals sent on these wire are typlically typically -48 volts, ground, and open.
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http://help.fonality.com/Fonality_Employees_Only/Support_Team/Trunks/T1%2f%2fPRI/T1_Troubleshooting#How_to_debug_a_Sangoma_T1_card_configured_for_E.26M_-_Wanpipe_RBST1 Troubleshooting