Running CUCM 7.1.5.
Normally, when off hook, when an additional phone call comes in you hear a beep. Is there any way to disable that?
The setting that comes into play in your scenario
On the IP Phone config (under Directory Number Configuration);
Line Settings for this Device
Ring Setting (Phone Active) Flash Only
This can also be set on a Clusterwide basis;
Clusterwide Parameters (Device - Phone)> Ring Setting of Busy Station*> Flash Only
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