Appendix A: Network Examples 349P0911588 Issue 01 Enterprise Edge 2.0 Programming Operations GuideIn this network, only the head office has trunks connected to the public network.The branch offices access the public network using IP trunks to the head office. Thisconfiguration allows for cost savings by consolidating the public access trunks.Users at all three locations access the public network by dialing ‘9’, followed by thepublic number. For example, a user in the west end branch might dial 9-555-1212(for a local call) or 9-1-613-555-1212 (for a long distance call). These public callsare routed to the Meridian 1 by the Enterprise Edge routing table. Routing tables atthe Meridian 1 will then select an appropriate public facility for the call.Private network calls are made by dialing a 4-digit private network DN. Forexample, if a user in the west end branch wishes to call a user in the east end branchwithin the private network, they dial 6221.Note: The quality of the IP trunk connection is assessed during initial call setup,and if the quality is poor, Enterprise Edge will try to find an alternate route tocomplete the call based on the fallback programming definitions in the routingtable. For simplicity, this example does not show programming for fallback.Therefore, in this example, if the quality of the IP connection is low during the callsetup phase, the call will be maintained at that quality. For an example of fallbackprogramming, see Toll bypass with Enterprise Edge VoIP Gateway on page 351.Note: Enterprise Edge VoIP Gateway requires a software keycode.VoIP Gateway and M1 NetworkingThe Call Managers examine the Called Party Number digits and route the call to thecorresponding IP address.Enterprise EdgeWest end BranchI.P. Address 192.1.1.2Network # 2221Received # 2221Internal # 2221Network # 6221Received # 6221Internal # 6221CentralOfficeEnterprise EdgeEast end BranchI.P. Address 192.1.1.3PRI(public protocol)Meridian M1DN: 4221I.P. Address 192.1.1.4IP IPIPWANRemote Gateway Configuration:West end: 6 192.1.1.34 192.1.1.49 192.1.1.4East end: 2 192.1.1.24 192.1.1.49 192.1.1.4
