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IP Telephony

Digit Collection

When a voice call enters the network, the router collects digits as follows:

How the Router Collects Digits

Step Action

1. The originating router collects dialed digits until it matches an outbound dial peer.

2. The router immediately places the call and forwards the associated dial string.

3. The router collects no additional dialed digits.

Example: Digit Collection

The figure demonstrates the impact that overlapping destination patterns have on the call-

routing decision. In example 1, the destination pattern in dial peer 1 is a subset of the

destination pattern in dial peer 2. Because the router matches one digit at a time against

available dial peers, an exact match will always occur on dial peer 1, and dial peer 2 will never

be matched.

In example 2, the length of the destination patterns in both dial peers is the same. Dial peer 2

has a more specific value than dial peer 1, so it will be matched first. If the path to IP address

10.18.0.2 is unavailable, dial peer 1 will be used.

Destination patterns are matched based on the longest explicit number match. Digits collected

are dependant on the configured destination pattern. The table describes how different number

combinations are matched and collected.

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Cisco GRP Manual do Utilizador Página 28