Nortel SRG50 Configuration Manual

Also see for BCM50: Installation and maintenance guide Keycode Installation Guide Integration guide Installation and configuration guide Documentation update

Contents

Nortel SRG50 Configuration Manual Manual pdf 38 page image

38 Chapter 4 CS 1000 considerationsNN40140-500NN40140-500Virtual trunk capacityThe SRG supports a number of simultaneous calls depends on the specific codec type used.SRG50 supports 24 virtual IP trunks that are either H.323 only, SIP only, or a combination of theH.323 and SIP.In normal mode, the codec selection used is controlled by specific programming of the CS1000. Inthis case: SRG50 supports up to a maximum of 15 Virtual trunks unless both the intrazone andinterzone codecs are configured as Best Quality (G.711) in which case, the maximum number ofvirtual trunks would be 24.In local mode, if the WAN has failed, there are no longer any virtual trunks available between theSRG50 and CS1000. However, the SRG50 will continue to convert calls from IP terminals forcommunication via the PSTN. In this case, if G.711 is used (recommended), the number ofsimultaneous calls from IP terminals to the PSTN supportable is a maximum of 24.For more information about virtual trunks for SRG50, see the Main Office Configuration forSurvivable Remote Gateway 50 (NN43001-307).Vacant Number Routing (VNR)The SRG does not support Vacant Number Routing (VNR). Instead, the SRG uses Call ForwardAll Calls to emulate VNR for the IP telephones that are in normal mode. Call Forward All Calls isautomatically cancelled when the phones revert to local mode.A single destination code and route (or a group of destination codes and routes) can be configuredon the SRG to route all calls not terminated locally by the SRG. These calls are routed over theVoIP trunks. If the VoIP trunks become unavailable, the calls are routed to the proper locationusing PSTN fallback. This feature is similar to the VNR feature on the Media Gateway 1000B(MG1000B).Seamless dialing requires that the start digit of the DNs are unique for each system (coordinateddialing plan). If the start digit is the same on both systems, the local users on the SRG must dial aseparate destination code before the main office DN.For details about dialing plan and routing configuration, see Setting up the private VoIP networkon page 65.Bandwidth managementThree levels of bandwidth management are supported by the CS 1000:• Network Bandwidth Management (NBWM)• Adaptive Network Bandwidth Management (ADBWM)• Alternative Call Routing (ACR)