[SR-Users] Using DNS log in

[Steve]

Hello,

I have a very basic Kamailio 5.4 configuration on Debian 11 with 
RTPProxy 2.2 behind a firewall. It works fine with the sip client 
logging into the server public ip address. However, the sip client is 
not able to log in when using a dns domain name directed to that public 
ip address. Is there a specific setting in the Kamailio and/or RTPProxy 
config files for using a dns domain name instead of a numeric ip address?

Also, is there a Kamailio module that allows use of encrypted keys 
instead of passwords when logging in?

Thanks for any info,

Steve