/mcpRestriction Feature To enable this feature with CTI applications, ensure that the CTI application is certified to work with this feature and this release. Otherwise, the CTI application may fail because the hold reversion feature may affect existing CTI applications. This feature gets disabled by default. See the following API documents for information about CTI requirements: • Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager • Cisco Unified JTAPI Developers Guide for Cisco Unified Communications Manager CTI Applications You cannot configure hold reversion settings for DNs that are associated with phones that do not support this feature. Only Cisco Unified IP Phones that support the hold reversion feature display the hold reversion timer settings in the Directory Number Configuration window. When Hold Reversion is configured for the system, the phone must support the feature or the feature does not activate. See Cisco Unified IP Phone administration guides for Cisco Unified IP Phone models that support hold reversion and this version of Unified Communications Manager for any phone restrictions with hold reversion. Cisco Unified IP Phones Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 473 Receiving Calls Hold Reversion Restrictions