Welltech SIPPBX 6200A - Manual (Page 66)

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Drop Enter the drop specified length of number. For example, you set
6 here and you do not set Add. If the called number is
070070101, the SIPPBX 6200A will drop 070070 then send 101
as called number.
If you set both of the Drop and Add, SIPPBX 6200A will Drop
first then Add. For example, the SIPPBX 6200A got a called
number 070070, which was sending from a non-subscriber of
SIPPBX 6200A, SIPPBX 6200A will drop 6 digits then add **999
as the destination number. **999 is the default number of auto
attendant. So the caller will hear greeting because the called
number will be routed to auto attendant.
Apply Click on the Apply button to save your customized settings and
exit this screen.
Cancel Click on the Cancel button to begin configuration this screen
afresh.