Delay call random

I’m having this strange problem that suddenly started a month ago.
Consider that this pbx has been active since 2020 and has never caused problems.

In practice, when a telephone makes a call to an extension or external number, it can happen that you wait up to 20 seconds for the call to start
It doesn’t happen always, but randomly.
Or a phone call may suddenly drop during the conversation.

Technical notes:
the phones switch is direct on the router, without firewall
However, if I put the direct telephone on the router, thus avoiding the internal LAN, the problem does not appear

What could it depend on?


You’ll need to provide a complete sip logs of a call that this happens.

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