LevelOne VOI-8001 - Manual (Page 53)

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1.4.2.11 VoIP Authorization Setting
/VoIP Setup/Routing Setup/Authorization/
When this gateway has been used for outbound call, it can enable to check the
remote caller gateway’s IP to decide accept or refuse the call. If define the IP range
here and enable the [Auth] option on the
/VoIP Setup/Routing Setup/VoIP
Call In/ , only the IP in range will allow to call out by this gateway.