[Asterisk-Users] Asterisk and Port

[Innocent Evil]

[user at server ~]# netstat -naptu | grep asterisk
tcp        0      0 0.0.0.0:2000                0.0.0.0:*
LISTEN      9231/asterisk
udp        0      0 0.0.0.0:2727                0.0.0.0:*
9231/asterisk
udp        0      0 0.0.0.0:4520                0.0.0.0:*
9231/asterisk
udp        0      0 xx.yy.zz.ww:5060            0.0.0.0:*
9231/asterisk
udp        0      0 0.0.0.0:4569                0.0.0.0:*
9231/asterisk


Hi,

My asterisk server is listening to the above ports.
would somebody explain, what  ports are for what.
Is there any security issue with these ports?
what firewall messure you do regarding these open ports?

Thanks