The configuration and provisioning for the All Calls mode is exactly the same
as the regular Alternative Call Routing for NBWM feature except that the
Alternate Routing for All Calls option is selected in overlay 117 or Element
Manager.

Operating parameters

This feature applies to all CS 1000 systems.

This feature applies to station-to-station, interzone calls. The call can be
between IP Phones or a TDM telephone at the main office and an IP Phone at
the branch office.

This feature is configurable for main office and branch office zones, not
virtual trunk zones.

The operation of the Alternative Call Routing for NBWM feature depends on
the proper configuration of the Network Bandwidth Management feature. If
Network Bandwidth Management encounters insufficient bandwidth for an
interzone call, the Alternative Call Routing for NBWM feature attempts to
re-route the call through the PSTN or TIE/MCDN route, if Alternative Call
Routing is configured for the originating zone.

Configure the Voice Gateway bandwidth zone and the IP Phone bandwidth
zone with the same number on each Call Server.

For alternately routed calls that originate at the branch office, the network
administrator must decide whether to program the main office to use
conventional PSTN or TIE/MCDN routes that physically terminate at the
branch office or to use conventional trunks at the main office. Outpulsed
digits on the PSTN trunks must be in the format required by the Central
Office serving the chosen system. For example, if the two systems are served