Chapter 3 CS 1000 considerations 39Survivable Remote Gateway 50 Configuration Guidebeing used between its own zone and zones belonging to other call servers. If the interzone QoSdegrades below an acceptable level, the available bandwidth is reduced automatically between thetwo zones. When the QoS between the two zones improves, the bandwidth limit is allowed toreturn to normal.Alternative Call Routing (ACR)Configuration for Alternative Call Routing (ACR) at the SRG50 includes datafilling the VirtualPrivate Network ID (VPNI) and Zone ID required by NBWM and ADBWM. However, additionalconfiguration is required and depends on the type of trunking provisioned at the main office:Attendant service or DID trunks (refer to “Configuring the SRG50 for Bandwidth Management:NBWM, ADBWM, and ACR” on page 39).ACR for NBWM allows a station-to-station call (that is, a call that does not use a trunk) tooverflow to traditional routes. Overflow can occur if there is insufficient interzone bandwidthavailable to carry the call, or if the QoS has degraded to unacceptable levels. The feature applies tostation-to-station calls between a branch office and main office as well as from one branch officeto another branch office, provided both stations are registered to the same main office.Network administrators who do not want calls to be blocked, yet have a limited amount ofbandwidth available, can use ACR to overflow calls to conventional trunks (PSTN or Tie/MCDN).ACR allows calls to be routed by overflowing them, trading off the capital cost of WANbandwidth against the incremental cost of overflowed calls.Configuring the SRG50 for Bandwidth Management: NBWM,ADBWM, and ACRTo configure the SRG50 for NBWM and ADBWM1 Obtain the Virtual Private Network ID and the Zone ID numbers configured at the main office.2 Use the SRG50 Element Manager to enter these numbers in the appropriate fields atConfiguration > Telephony > Dialing Plan > Private Network > Dialing Plan - PrivateNetwork panel > VoIP subpanel (Figure 4).
