The port 5060 is the default one for udp/tcp/sctp, then there is 5061 for tls. I have seen implementations that adds it when missing and some that removes it when present. So it is not 100% problem free to add the port. Having the option to skip the prefix check is better and more flexible.
I will close this here, if you want to discuss more, perhaps sr-users mailing list is the best place, being a topic on SIP usage and patterns, than something like an issue in the code.
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