Hello mr.max

                       TG3442 is telephony gateway modem which is the combination of modem and router, if you are looking for modem GUI login credentials Username will be admin and if you are looking for the Wi-Fi credentials the default Wi-Fi name and password will be mentioned on the modem label. The above mentioned are the default credentials of the modem if you have customized before then you need to check for the customized one or you need to reset modem to use the default login credentials.

Let us know if this helps.