NEC SP5008A - Manual (Page 19)

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2.3.2 SIP Setting
Primary proxy/P2P IP Specify the data of primary proxy : Enable/Disable, IP
address, Port#, Domain Name, Expire time and MWI TTL.
The P2P mode will be explained in paragraph Appendix A
Secondary proxy Specify the data of secondary proxy: Enable/Disable, IP
address, Port#, Domain Name, Expire time and MWI TTL.
When you enable secondary proxy, it will start to register no
matter whether primary proxy is registered or not. However, it
will be used only when primary proxy is not registered or the
incoming call is coming from it.
Outbound proxy Specify the data of Outbound proxy: Enable/Disable, IP
address and Port#.
Secondary Outbound proxy Specify the data of Outbound proxy for secondary proxy:
Enable/Disable, IP address and Port#.
Representative Number The representative number is working as a SIP trunk for the
selected FXS line (for all FXS or FXO/FXS combination
model) or FXO line (for all FXO model). When an incoming
call to the representative number, the selected FXS or FXO
port will be hunted.
Enable Enable the Line, the default setting is “Enable” and it will