disconnection prb is usually as to do with line polarity, reverse current.
if ur signalling is in &&M mode & ur polarity is wrong, u may get disconnect after alart
try reverse the polarity of your PSTN line set ur signalling in E&M. better still.. try FXO signalling has that does not have much problem with polarity
also make sure u have all swithes on your Channel Bank if any; are set correctly as to your signalling
Thank i made any test with the battery reversal but it is not working. it is done only when i use the ptt line connect to the PBX and connect another way to Channel Bank.
so the line is disconect trully when i use the PBX.
what can be the problem.
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