[Serusers] DNS Lookup and other issue

If I setup an UA with URL sip:beeplove@mydomain.org my client is going to find its sip server from DNS SRV record, right?

If I have these in nameserver _sip._udp SRV 0 0 5060 sip.mydomain.org. _sip._tcp SRV 0 0 5060 sip.mydomain.org.

is that mean, sip.mydomain.org is my registar server? or proxy server or both?

And If my UA have an option to specify proxy and registar server, UA is not going to lookup SRV record, right?

Please correct me someone, if I am understading wrong.

Thanks Mohammad

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