Cisco Cisco Computer Telephony Integration OS 8.5 Developer's Guide

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Chapter 3      CIL Coding Conventions
Using Button Enablement Masks
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CTI OS Developer’s Guide for Cisco ICM/IPCC Enterprise & Hosted Editions Release 7.1(1) 
For any given event, the CTI OS Server calculates the appropriate button 
enablement bitmask, and sends it to the CIL with the event parameters. The button 
enablement bit masks are discussed in detail in 
 You can use these masks to write a custom softphone-type application 
without writing any custom code to enable and disable buttons. This is also the 
approach used internally for the CTI OS ActiveX softphone controls.