Alternative Call Routing for Network Bandwidth Management Page 133 of 258
Before deciding whether to program the steering codes as Distant Steering Codes (DSC) or Trunk Steering Codes (TSC), take into account that the system counts the digits in calls that start with a DSC.
Without Flexible Numbering Plan (FNP), DSC calls must have the same number of digits as specified in LD 86 ESN (the NCDP prompt). With FNP, fewer digits are acceptable, if the FLEN prompt is programmed correctly.
The maximum length of a CDP DN is seven digits (if DNXP is not equipped), and ten digits, if DNXP is equipped. For more information refer to Dialing Plans: Description
Calls preceded by the ALTPrefix can be handled by the Vacant Number Routing (VNR) feature. Use Flexible Numbering Plan (FNP) software for this type of routing.
Examples of Alternative Call Routing for NBWM in operation
The main office systems shown in the diagrams in this chapter are CS 1000S systems. However, this feature is supported on any CS 1000 system.
A call from a branch office telephone to a main office telephone
Figure 42 on page 134 shows two CS 1000 systems. The system shown on the left is a main office. The system shown on the right is a branch office. Both systems have access to the PSTN. The Wide Area Network (WAN) is shown in the center with a gatekeeper/Network Routing Service (NRS) that can be co-resident with a Signaling Server. IP Phones are also shown associated with each system. Telephone A belongs to the main office. Telephone B is a telephone at the branch office registered to the main office. There are two bandwidth zones indicated by the dashed line (main office zone - MO zone and branch office zone - BO2 zone). Telephone A and the Media Gateway belong to the MO zone. The branch office and Telephone B belong to the BO2 zone.
Main Office Configuration for Survivable Remote Gateway 50 Configuration Guide
