there is some functionality in chan_pjsip similar to “autodomain=no” of chan_sip, which only allows the registration of endpoints in asterisk using an FQDN and that does not allow the registration of endpoints using the IP address of the Asterisk server.
This force the endpoint to have an ip address or fqdn, that match the one listed in the pbx, but no works like autodomain/domain function in chan_sip does.