Users at a branch site report that calls to a newly provisioned 4-digit internal extension range (5XXX) sometimes route to voicemail instead of ringing the target phones. The dial plan administrator wants to observe, in near-real time, exactly how Cisco UCM performs digit analysis for these calls—including which partition and pattern are matched and whether inter-digit timeout is triggering premature routing. Which Cisco monitoring tool and approach should the administrator use to capture this live digit-by-digit analysis behavior?