PAM/LDAP authentication for webmin

In order to make it work, I have the following lines in /etc/webmin/miniserv.conf, which means it allows all unix users of admin group to login to webmin with their PAM password and act as root user of webmin or all unix users of user group to login with their PAM password and act as dnsmasq user of webmin.
unixauth=@admin=root @user=dnsmasq
pam=webmin

The following line in /etc/webmin/miniserv.users defines users of webmin (two users defined with name root and dnsmasq)
root:x:0::::::::
dnsmasq:x:0:::::::0:

The following lines in /etc/pam.d/webmin provides LDAP authentication for PAM password
auth sufficient pam_ldap.so
auth include system-auth

account sufficient pam_ldap.so
account required pam_nologin.so
account include system-auth

password required pam_ldap.so
password include system-auth

session sufficient pam_ldap.so
session include system-auth

Reduce the number of ports opened by Asterisk

When I type the command netstat -lnp | grep asterisk as root, I found the following ports were opened by Asterisk.
tcp 0 0 192.168.0.1:5038 0.0.0.0:* LISTEN 2850/asterisk
tcp 0 0 0.0.0.0:2000 0.0.0.0:* LISTEN 2850/asterisk
tcp 0 0 192.168.0.1:8088 0.0.0.0:* LISTEN 2850/asterisk
udp 0 0 0.0.0.0:4569 0.0.0.0:* 2850/asterisk
udp 0 0 0.0.0.0:2727 0.0.0.0:* 2850/asterisk
udp 0 0 0.0.0.0:4520 0.0.0.0:* 2850/asterisk
udp 0 0 0.0.0.0:5060 0.0.0.0:* 2850/asterisk
unix 2 [ ACC ] STREAM LISTENING 762262 2850/asterisk /var/run/asterisk/asterisk.ctl

I know that the following ports are typically used by my Asterisk
tcp 5038 manager
tcp 8088 AsteriskNOW
udp 4569 iax2
udp 5060 sip
udp 18000-20000 rtp (rtp.conf)
Therefore I put the following lines into /etc/asterisk/modules.conf
; Don't load skinny (tcp port 2000)
noload => chan_skinny.so
; Don't load MGCP (udp port 2727)
noload => chan_mgcp.so
; Don't load dundi (udp port 4520)
noload => pbx_dundi.so

Upon restarting Asterisk, the command netstat -lnp | grep asterisk only shows the following:
tcp 0 0 192.168.0.1:5038 0.0.0.0:* LISTEN 3168/asterisk
tcp 0 0 192.168.0.1:8088 0.0.0.0:* LISTEN 3168/asterisk
udp 0 0 0.0.0.0:4569 0.0.0.0:* 3168/asterisk
udp 0 0 0.0.0.0:5060 0.0.0.0:* 3168/asterisk
unix 2 [ ACC ] STREAM LISTENING 764510 3168/asterisk /var/run/asterisk/asterisk.ctl