The call managers are working correctly, and the call established successfully if we bypassed the ISA server, so I think that the problem is in the ISA, But we already open all protocols between the two call managers!!
We have two call managers, one in a zone and the other one is in a different zone, between them is the ISA Server, it allows all protocols between the two call managers, there is a trunk (non-gatekeeper)between both call managers,the call setup is done successfully, but when trying to answer the...
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