This behaviour can be as a result of an over lapping pattern. When you dial the number for the first time, CUCM will try to match a pattern digit-by-digit and it would wait for the T302 timer (Inter digit timeout) to happen to select the appropriate pattern, if an over lapping pattern exists.
However, when you redial the number, it becomes an enbloc call and would route through the best match avoiding any delay.
There are several phone models that uses Enbloc call by default.
In order to troubleshoot the issue further, please provide the following:
1. Numplan report.
2. The number you are dialing
3. The list of partitions in the Line and device CSS of the calling phone.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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