Cisco Cisco Computer Telephony Integration Option 8.5 Developer's Guide

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Chapter 4      Building Your Application
Working with Calls
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CTI OS Developer’s Guide for Cisco ICM/IPCC Enterprise & Hosted Editions Release 7.1(1) 
Checking Not Ready Bitmasks in OnButtonEnablementChange() Event
A client application receiving the OnButtonEnablementChange() event must 
check both the ENABLE_NOTREADY and 
ENABLE_NOTREADY_WITH_REASON bitmasks in the event.
Caution
Failure to check both the ENABLE_NOTREADY and 
ENABLE_NOTREADY_WITH_REASON bitmasks may lead to problems 
properly displaying a NotReady control to the agent.