When the incoming call is answered at the desk, CM sends a disconnect message to terminate the call setup with the mobile device. You should be able to verify this in a trunk trace, although you may need an MST trace to see the Q.931 signaling in detail for this issue. It could be the disconnect is being ignored or arriving too late?
You can try experimenting with some of the options on the off-PBX config set screen. Toggle "Fast Connect on Origination" and test to see if there's any difference.
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