NEC SP5008A - Manual (Page 17)

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2.3 General configuration
To make VoIP calls, you will need a SIP account provided by the SIP Proxy you are
registered with. To configure the relevant SIP settings, please refer to the
instructions explained below.
2.3.1 PABX Mode (SP5018A only)
This quick setting is used for MICRONET SP5018A to operate in PABX connection
mode between PSTN and traditional PABX. Enable PABX mode for ISP/ITSP
scenario that forbids SIP call to/from PSTN via the gateway (SP5018A). The call
scenario will be working as below:
1. For FXO incoming call, it will route to corresponding FXS directly (1 by 1)
2. For FXS outgoing call, it will route to VOIP except those prefix set in FXO
dialing Prefix.
3. For VOIP incoming call, it will route to FXS based on the called number
4. When VOIP call is failed to be called out such as register fail or network
issue, the call will be route to FXO as backup.
5. When MICRONET SP5008A / SP5018A / SP5058A is malfunction or
power failure, the all call will be directly bypassed to FXO.
PABX Connection To enable PABX behavior or not.
SIP Setting Please refer to 3.3.2.1
Representative Number Only It is used (Yes) when you only have 1 SIP account and
would like to be shared for all FXS lines. Please refer to