Telnet Zte F6640 ((full)) Guide

(Replace IP with your device’s actual address)

sendcmd 1 DB set SIPALG Enable 0 sendcmd 1 DB save reboot telnet zte f6640

If you need to turn your combo ONT/router into a pure modem (bridge mode), disable hidden firewall features like SIP ALG, or extract your GPON credentials to use a third-party router (like a Ubiquiti or MikroTik), Telnet is the only way. (Replace IP with your device’s actual address) sendcmd