How to Disconnect/Connect from Broadband connection from TELNET?

CAdecoder       dd              igmpproxy       ping6           tcci
ConfigFilter    delgroup        inadyn          portbindcmd     tce
EmappS          deluser         inetd           ppp_monitor     tcwdog
[              dhcp6c          init            pppcmd          test
ac              dhcp6s          insmod          pppd            tftp
acl             dhcpdetector    ip              pppoe-relay     tftpd
addgroup        dhcrelay        ip6tables       pppstat         top
adduser         diame         ipcs            ps              tr069
adslcmd         dmesg           iptables        ptmcmd          tr69
adslstat        dnsmasq         iwpriv          pwd             traceroute
algcmd          dropbear        kill            qoscmd          traceroute6
arp             ebtables        killall         radvd           true
ash             echo            klogd           reboot          udhcpc
ated            ecmh            ln              ripd            udhcpd
atmcmd          email4log       login           rm              umount
autoFwUpgrade   env             ls              rmdir           uname
awk             ethcmd          lsmod           rmmod           uptime
basename        expr            maceui          route           usleep
bftpd           ez-ipupdate     mailsend        rt2860apd       utelnetd
boa             false           md5             run-parts       vah
br2684ctl       firewallcmd     mdev            sed             vahcmd
brasinfo        free            mkdir           sh              vconfig
brctl           freeMemory      more            sleep           w
busybox         ftpget          mount           smuxctl         wan
cat             ftpput          mtd             snmpd           wc
cfg_manager     ftpset          mtr             sys             wget
chmod           getty           mv              syscmd          wlan
cp              grep            netstat         sysctl          wlancmd
cpu             head            nslookup        sysdiagd        wscd
crond           hostname        ntpclient       syslogd         yes
cut             hw_nat          passwd          taskset         zebra
cwmpcmd         ifconfig        pidof           tc
date            igmp            ping            tcapi

Got all those commands on my Zyxel router, is there a way to disconnect/connect from broadband connection without reboot the router? The purpose of this is get a fresh IP address by using telnet. btw my connection uses Dynamic IP. Thanks in advance.

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