As Digits are dialed, Call Manager matches the digits against the configured Route Patterns (or DNs) and determines a set of potential matches . These potential matches are a collection of Route Patterns. Call Manager attempt to match the dialed digits against the potential matches and ultimately against the closest matching Route Pattern.
Recall also that if configured Route Patterns contain wildcards, then sometimes it might be necessary for Call Manager to wait for an interdigit timeout before routing a call.
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