NEC SP5008A - Manual (Page 65)

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4. Operation
4.1 Peer to Peer mode (FXO to FXS)
In this application, the distance of PABX extension is not limited. You can use the
same PABX in two or more branches.
Configuration:
1. Side A (FXO): IP address: 10.1.1.2, number is 2000 to 2008
2. Side B (FXS): IP address: 10.1.1.3, number is 1000 to 1008
Side A : (SP5058A: IP address 10.1.1.2)
General Configuration / SIP Setting
Primary proxy/P2P IP
(Side A--FXO)
Specify the destination (Side B) IP Address of
Peer to Peer mode, and specify the port# with
5076.
Call number configuration
Representative number
(Side A -- FXO)
Enable the representative line