How to limit number of incoming channels on sip trunk?

As per title, (Pj)sip trunk channel number setting purpose is to limit OUTGOING calls.
How to limit INCOMING number of concurrent calls without involve service provider in this ?

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Whether the service provider is involved or not, you can’t control the number of people trying to call you.

You could, of course, use a dynamic route or custom context to send calls to Terminate Call → Busy if the trunk channel count exceeds some limit.

What problem are you trying to solve? If you don’t have sufficient staff to handle the call volume, IMO it’s better to route to an announcement that offers a callback, takes a message, or at least suggests a better time to call. Some younger callers may have never before heard a busy signal.

If it’s a technical issue (limited bandwidth or server capacity, etc.) it may be better to fix that than to annoy customers.

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