SRV records and port numbers

Hello,

I am finding conflicting information about external SRV records. 

_sipfederationtls._tcp.domain.com

_sipexternaltls. _tcp.domain.com

_sip._tls.domain.com

All of those records should point to sip.domain.com.  The problem is that I see conflicting information about the port number.  In some places it says that the port number should be 443, others say it should be 5061.

What is the port number that I should use?  Which one is correct?

Thank you.

Thank you. Eric.