Icoming calls not working in pjsip

Hello! Why is it that I cannot receive a call in older versions of asterisk through port 5060 of pjsip, with neither tcp nor udp transport protocol, but in asterisk 18 I can?

However, when I try to make a call, my softphone says: the service is not available.

logs are always needed

Unfortunately, Iā€™m still very new to this asterisk. Is it possible that the maintainers of the asterisk project have set something so that older versions of asterisk can be unusuable? Interestingly, pjsip works on asterisk 18

No. It is not possible.

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