freeswitch@internal> 2009-04-29 11:46:05 [DEBUG] sofia.c:4242 sofia_handle_sip_i_invite() IP 75.74.xxx.xxx Rejected by acl "domains". Falling back to Digest auth.

I am a total noob on this. I replaced my original acl.conf.xml with this...

<configuration name="acl.conf" description="Network Lists">
        <network-lists>
          <list name="test1" default="deny">
            <node type="allow" cidr="75.74.xxx.0/24"/>
          </list>
        </network-lists>
</configuration>