ZyXEL Communications ISG50-ISDN, Application Note

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4. How to Expand the Current Networking Infrastructure to Fulfill Multi-site Requirements?
Since the company is growing, it is planning to setup two branch offices. The network administrator would like to expand the current
networking infrastructure to fulfill the requirements of multiple sites. In order to allow the main office and the branch offices to make calls to
each other more easily, the administrator needs to establish a trusted peer between two ISGs located in two offices. Furthermore, to reduce
the cost of outbound line deployments in the remote offices, the extensions must make calls out through the BRI trunk of the main office.
Moreover, the incoming calls on the BRI trunk can reach the extensions of the remote offices over a trusted peer with LCR and group
management settings. The network administrator deploys the ZyWALL USG product to offer robust protection and uses the ISG50 as a pure
VoIP service.
Work with ZyWALL USG products