ZyXEL Communications ISG50-ISDN, Примечание к применению

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Examples:
DND (Do Not Disturb): When DND is enabled on #1006 and a caller tries to reach this extension, he will hear a voice prompt that the extension
is not available. The extensions configured in the “White List” can still reach #1006.
Blind Forward: When Blind Forward is enabled on #1006, every caller who tries to dial #1006 will be redirected to a pre-configured extension
or voice mail.
Busy Forward: If a caller dials #1006 while #1006 has a phone call with someone, the caller will be redirected to a pre-configured extension or
voice mail when Busy Forward is enabled. The definition of “Busy” is that “Call Waiting” is disabled.
No Answer Forward: A caller dials #1006 but #1006 doesn’t answer the phone. This caller will be redirected to a pre-configured extension or
voice mail when the ring time of #1006 exceeds the value of Default Ring Time. The default ring time is 20 seconds. You can change the value of
default ring time in CONFIGURATION > PBX > Global > SIP Server > Default Ring Time.
After Office Hours: If the incoming call is not during the office hours, you can allow the incoming call to be forwarded to a specific extension
number or voice mail.
Black List: A caller’s number is on the Black List of #1006. When this caller dials #1006, he will hear the disconnect tone.
Block the calls without Caller ID: You can block the incoming calls which are without call ID.