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Zone-based digit manipulation
Main Office Configuration for Survivable Remote Gateway 50
For SRG users in Normal Mode, it may be desirable to provide routing that is
different from that provided to main office users. For example, it may be
desirable to route certain calls directly to the SRG PSTN trunk, rather than
receive the same routing as non-SRG users in the main office.
To achieve this, the Zone Access Code Behavior (ZACB) and Zone Digit
Prefix (ZDP) properties of the branch office zone are used to add digits to the
digits dialed by the SRG user. The resulting digit string is then used to route
the call. The net effect of this is that an SRG user's and a main office user's
call can be routed differently, even though the dialed digits were the same.
For example, if "1 87654321" is dialed, where "1" is the Access Code, then:
•
for a main office user, the call is routed based on the dialed digits.
•
for an SRG user, the digits undergo zone-based digit manipulation (such
as inserting "101"), and the call is routed based on the new manipulated
digit string (in this example "1 101 87654321").
By performing this zone-based digit manipulation, calls from main office
users and SRG users undergo different routing. Some applications are:
•
routing all SRG users' calls to the SRG PSTN trunk
•
routing SRG users' local calls to the SRG PSTN trunk
•
routing all SRG users' calls to the main office PSTN trunk
•
routing SRG users' long-distance calls to the main office PSTN trunk
Special considerations apply in the case where a single Access Code is used
for both on-net and off-net calls, especially when UDP is used. Routing of on-
net and off-net calls is normally different. The Call Server ESN Special
Number provisioning (refer to Note 1 on
and Gatekeeper Numbering Plan Entry provisioning (refer to the note on
page
187) should be used to provide this different routing.
In the case where a single Access Code is not shared, that is, where one
Access Code is exclusively used for UDP on-net dialing, standard procedures
should be used. Refer to Dialing Plans: Description (553-3001-183).
Dialing Plan configuration
page 182
Page 171 of 258
and Note 2 on
page
Configuration Guide
182)
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