Delay to connect call (instant INVITE packet sent)

Delay to connect call (instant packet sent with the INVITE). I checked some posts about DNS issues with delay, how can I confirm that?

The sip invite is arriving fast, but the answer from my server is over 15 seconds.

The server was working good, but yesterday started to happen this delay.

Call with 15 seconds delays over 20 seconds to start ring.

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