I have a Patton SN4114 VOIP Gateway that is on the latest firmware. We are using 3CX Version 15.5. I am consistently getting 7 sec delay from the time a call is sent to the time it rings. Is there a way to shorten that? I have the trunk set to "Wait for Dial Tone" with the same result. Changing it to 1 or 2 seconds does not change anything.