LevelOne VOI-8001 - Manual (Page 52)

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mean any call number with prefix 601 will always be forward to another VoIP
Gateway locate at hk.big.com and dial out number is 301.
When the line 2 is busy and another VoIP with prefix 602 Call in, it will forward
it to the assist.big.com with same number (defined on OnBusy).
When VoIP Call In number with prefix 602, it will ring the line 2 for 30 seconds
(defined on No Answer Sec.), if no one answer line 2 within 30 seconds, it will
forward the call to another VoIP Gateway located at assist.big.com and dial out
number is 610 (defined on No Answer) .