Draytek Vigor 2110 User Manual page 233

2. After finishing all the settings here, please click OK to save the configuration.
Additionally, you can set advanced settings for call barring such as Block Anonymous, Block
Unknown Domain or Block IP Address. Simply click the relational links to open the web
page.
For Block Anonymous – this function can block the incoming calls without caller ID on the
interface (Phone port) specified in the following window. Such control also can be done based
on preconfigured schedules.
For Block Unknown Domain – this function can block incoming calls (through Phone port)
from unrecognized domain that is not specified in SIP accounts. Such control also can be done
based on preconfigured schedules.
For Block IP Address – this function can block incoming calls (through Phone port) coming
from IP address. Such control also can be done based on preconfigured schedules.
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Vigor2110 Series User's Guide