Customer has reported a intermitten fault, When call are tranfered from one CUCM cluster to Cisco IP PHONE on another CUCM cluster is getting dropped intermittenly. ( call is dropped after hitting the Tranfer key second time )
Your issue is rather generic. This could be caused by multiples causes. Your best option is to capture and instance of a call drop with traces from both clusters, and either analyze them yourself or open a case with TAC for troubleshooting.
Changing configuration without looking at the logs for a failure itself it's usually risky.
Common problems are related to codec mismatch, lack of MTP or XCODE sessions, or phones unregistering.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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