Question

Disable randomised port at SIP options does has no effect.

Answer 1

When you disable the port randomization for SIP, Zoiper would start listening on port 5060(by default), or whichever port you have selected, if this port is currently available.

Comments

I ask, because that does not work. Zoiper uses fathermore different other ports and not the selected.
What can be the reason?

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What is the operating system and version of Zoiper?

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The operating system is: Windows 10

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Keep in mind that 5060 is only listening port, not source.
You may check what app listens on 5060 by using (in CMD as Admin): netstat -ano | find "5060"

The last column would be the process ID that binds to this port, which you may search for in the Task Manager.

I have made a quick check and Zoiper listens as it should.
It would not listen on the selected port only if its blocked by firewall or the port is already bound by another app.

P.s. I've made the test with Zoiper Pro 5.6.6

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"When you disable the port randomization for SIP, Zoiper would start listening on port 5060(by default), or whichever port you have selected, if this port is currently available."
That is, what not work with me! Can you please check this "SIP option" on windows 10.

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Yes, I did and it works.

Try in CMD: netstat -ano | find "5060"
Then see what it would return. Check the PID number from the last column in the Task Manager.

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Thanks, but I have deleted Zoiper 5 four days ago, because: Disable randomised port at SIP options had no effect.
I found an other solution.