OfficeServ 7100 SPECIAL APPLICATIONSTECHNICAL MANUAL PART 2 JANUARY 20092.6.16Public and Private IP ConnectivityThe MP10/MP10a, MGI and ITP keyphones can be used on the private IntranetLAN/WAN and also have a public Internet presence. This is accomplished by definingthe public address on the MP10/MP10a and MGI cards. ITP keyphones can also beregistered as public IP addresses but still communicate with the private networkstations and system. Figure 7 shows the relationship between public and privatenetworks.In any case with Public network exposure there must be a public address for theMP10/MP10a and each MGI that will connect to the Public network. The remote ITPmust have at least one public IP address available. When using a NAT router at theremote ITP end there only needs to be one public IP address.Figure 7. Public and Private NetworksPrivate Network Public Network“Public” networks can be defined as a network that is open to the public Internet.Anyone with access to the Internet can access the endpoint(s) via an IP address. Thisendpoint can be a server, email server, PC or router.“Private” network is the network that has an IP addressing scheme that is used behinda router to protect the user endpoints from being accessed by the public. In somecases the router has a “NAT” (Network Address Translation) setting. This allows theuser(s) behind the NAT router to look as a single address to the public network.InternetISPISPRouter