Route Groups
In order to control telephony devices like gateways, you create route groups.
These gateways can be created using H.323, MGCP, or Skinny Gateway Protocol.
End telephony devices that would use H.323 would be programs such as
Microsoft NetMeeting and the Cisco CallManager Remote Connections that act
as H.323 Gateways. In this setup, the route group can connect to one or more
devices, and is able to select between these devices based on preference. In this
instance, the route groups can direct all calls destined to the primary device to
the secondary device if the main device is not available. Again, this can be considered
a trunk group.
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Digit Manipulation for the Cisco CallManager
You can only apply digit manipulation to route patterns for outbound
calls only. This is because the digits need to be sent to the route list plus
the route groups. Individual route groups can have specific digit
changes for the same route pattern. You usually see this where a dialed
number needs to have different modifications like when devices need to
dial seven digits to reach a remote office that has a four digit internal
dial plan. This often happens when you have a call that cannot be completed
through the WAN and needs to be routed though the PSTN. What
would occur is the Cisco CallManager would prepend the first three
digits onto the dial string. A route pattern can be associated with only
one route list.
Configuring & Implementing…
300 Chapter 9 • AVVID Dial Plans
You can also point one or more route lists to the same route group. All the
devices within this route group have the same characteristics, like path and dial
string changes.There is also prioritization, as the string manipulation in a route
group overrides the changes of a route pattern.