Block- and allowlists are created in the exchange line routing for system-wide usage and are assigned to users, groups or special functions. The PBX distinguishes two types of lists:
Blocklist incoming
If there are certain persons who you do not want to call you or if you do not want callers to call an extension, their external numbers and/or all anonymous callers can be assigned to a blocklist for incoming calls.
Allowlist incoming
If you would still like to allow specific people to call you despite enabling the do-not-disturb function, the external numbers of these people can be assigned an allowlist for incoming calls in the PBX.