Problema connessione a server

[LowSlow]

machine_id=
default_voice_port=4900
voice_ip=0.0.0.0
licensepath=
filetransfer_port=4888
filetransfer_ip=0.0.0.0
query_port=4889
query_ip=0.0.0.0
query_ip_whitelist=query_ip_whitelist.txt
query_ip_blacklist=query_ip_blacklist.txt
dbplugin=ts3db_sqlite3
dbpluginparameter=
dbsqlpath=sql/
dbsqlcreatepath=create_sqlite/
dbconnections=10
logpath=logs
logquerycommands=0
dbclientkeepdays=30
logappend=0
query_skipbruteforcecheck=0

Comunque facendo quel comando la porta risulta. Per avviare faccio ./ts3server_startscript.sh start inifile=ts3server.ini
Mi sto accorgendo che facendo "netstat -tulnp" la porta voice risulta, ma non c'è scritto "LISTEN", invece per le altre due porte c'è scritto, è qui il problema?

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      307/sshd
tcp        0      0 0.0.0.0:4888            0.0.0.0:*               LISTEN      20021/ts3server_lin
tcp        0      0 0.0.0.0:4889            0.0.0.0:*               LISTEN      20021/ts3server_lin
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      548/sendmail: MTA:
tcp        0      0 127.0.0.1:587           0.0.0.0:*               LISTEN      548/sendmail: MTA:
tcp6       0      0 :::22                   :::*                    LISTEN      307/sshd
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           214/avahi-daemon: r
udp        0      0 0.0.0.0:4900            0.0.0.0:*                           20021/ts3server_lin
udp        0      0 0.0.0.0:40121           0.0.0.0:*                           214/avahi-daemon: r
udp6       0      0 :::5353                 :::*                                214/avahi-daemon: r
udp6       0      0 :::44403                :::*                                214/avahi-daemon: r