Welltech SIPPBX 6200A - Manual (Page 63)

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Example:
If user set prefix as
002 , digits length as 12, Primary destination as 888, Drop as 3 , and
Add as 0 .
When caller called 002 912345678, the prefix is 002 ; length is 12, so this call matches the
routing rule.
002 912345678→912345678 (Drop 3 digits) →0912345678(Add 0 )
Finally, SIPPBX 6200A will send 0912345678 to Trunk ID 888.