NEC Univerge SV8100 Features And Specifications Manual page 1526

Issue 12.0
A Secondary NetLink system is able to utilize its own SIP trunks independently to the Primary system.
Refer to Figure 2-73 Example – Version 5000
Conditions
Main software Version 5000 or higher and the Version 5.00 Main Version License

(0034) are required to support the NetLink Multi-SIP Carrier feature.
It is possible to set Register ID for trunks that belong to that specific system. For example, a

Register ID set in the Primary system cannot be assigned to a trunk in the Secondary
system. The allocation of the trunk and Register ID of Program14-12 must be in the same
system.
In order to use CPN in a secondary system, Program 51-19 must be turned on for those

extensions. Once enabled, CPN may be sent on a per station basis using Program 21-19.
Once NetLink is established, PCPro or WebPro must be used to change the system data

related to the SIP trunks.
Any SIP trunks that are built in a system before establishing NetLink will be deleted after

establishing NetLink.
SIP trunks are assigned in the order of system set up. System ID's are needed to assign

Program 10-40 data.
With Version 5000 (V5.00 or higher) software, the following programs no longer replicate

and can be set on a per system basis: 10-23, 10-37, 21-19, 84-13, and 84-14.
Each NetLink system can use either SIP trunks to a provider or SIP trunk TIE line mode but

not both.
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to see the advantage of this feature:
Figure 2-73 Example – Version 5000
UNIVERGE SV8100
SV8100 NetLink