Can you pls help me with little misunderstanding.

According to https://freeswitch.org/confluence/display/FREESWITCH/ACL#ACL-Users

I can create ACL for a user and also specify a CIDR in <user> tag. 

Like  

<user id="1000" cidr="12.34.56.78/32,20.0.0.0/8»>
So, what is difference between cidr parameter and «auth-acl» parameter, and can I specify, that users can register only from specified network range?

Like I want my user 1001 register only from 10.0.20.0/24 and user 1002 register only from 10.0.30.0/24, but they must register with username and pass.