We need more information to be able to help on this issue.
For example, do you know anything unique about dropped calls? Is it always the same number or same area code or same set of phones or same set of ports on the DT24+ or always incoming or outgoing calls? Anything unique to characterize the calls. Next, which direction is the disconnect coming from. If the call is truly dropped then one of the call legs is abruptly disconnected without user intereference. Is the Call manager receiving or sending the disconnect?
The TAC should be able to help you determine the cause. It may be hard to capture debugs since this is intermittent but over time we should be able to find out what is happening if we can find a pattern.
Can you please clarify. When you say that calls get dropped and the phone gives a busy signal, is it restricted to 1 phone, or is it all phones return a busy signal? And is it in one direction or does it happen on both (ie when dialling inbound to the ip network from the PSTN or vice versa?) How have you been fixing the problem? by resetting the gateway card?
The reason i'm asking is to see if you're experiencing a similar problem to what i had in the past.
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