/system script
add name=tc owner=admin policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source=":if ([/interface get [find name=\"l2tp-out1\"] running]=!true) do={\
    \r\
    \n:interface ppp-client set apn=wap numbers=0\r\
    \n:delay 25\r\
    \n:interface ppp-client set apn=mms numbers=0\r\
    \n:delay 10\r\
    \n:interface disable l2tp-out1\r\
    \n:delay 1\r\
    \ninterface enable l2tp-out1\r\
    \n}"