What is the difference between users.conf and sip.conf?

Question

Asterisk

In the users.conf example, it is written that it is easier to register users in it, but not "more flexible".
Began to use users.conf because of cid_number which does not work in sip.conf
So, through what it is easier and more convenient to configure? Because I didn't really notice the difference.
Where can I see the full description of all the users.conf parameters (in the example, some items are skipped, you can use eng)?

Answer 1

sip.conf contains additional parameters related to the SIP protocol itself and may contain user data using this protocol
users.conf contains user parameters for all protocols, but there are much fewer settings specific to each protocol.