But if I use that gateway to receive call (termination) it fail. But when I downgrade it to version 12.0, it work fine. Can anyone tell me why this can happen ? Thank you.
You'll need to be more specific on what exactly the IOS version you were using (working and not), and what the problem is (what symptoms did you see). Also, what signaling type and what configuration is used? Depending on what is wrong, it might be necessary to capture some relevant debugs, but I can't say for sure yet.
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