Overview Page 23 of 254Main Office Configuration for SRG200/400 Release 1.5 Configuration Guide• Network Signaling (NSIG) package 37. This package is optional forSRG IP Phones to access set-based Network Class of Service (NCOS)features.• Adaptive Network Bandwidth Management package 407.• Alternative Call Routing for Network Bandwidth Management.For software and hardware requirements for SRG, see the SRG200/400Release 1.5 Configuration Guide.Normal Mode and Local Mode overviewNormal Mode and Local Mode overview provides a description of thefollowing sections:• Normal Mode• Local Mode• Survivability• Recovery to Normal Mode• Local Mode operation• Virtual trunksIP Phones that are physically located at the SRG but are registered with themain office are in Normal Mode. The main office provides centralized callprocessing for the SRG IP Phones. These telephones are registered to themain office TPS and are controlled by the Call Server at the main office.Users of the SRG IP Phones receive the features, key layout, and tones of themain office Call Server. This provides feature and application transparencybetween the branch office and the main office.Normal ModeIP Phones that are physically located at the SRG but are registered with themain office are operating in Normal Mode. In Normal Mode, the main officeprovides centralized call processing to all applications transparently to all IPPhones at the Branch Office. All IP Phones at the Branch, in Normal Mode,
