Cisco Cisco Computer Telephony Integration OS 8.5 Developer's Guide

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CTI OS Developer’s Guide for Cisco Unified Contact Center Enterprise
Release 8.5(1)
Chapter 3      CIL Coding Conventions
Using Button Enablement Masks
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 custom code to enable and disable buttons. This approach is also used 
internally for the CTI OS ActiveX softphone controls.