/mcpExtend Mode Support for CSF Is Removed In Cisco Unified Communication Manager Release 9.0 a CSF device had the ability to add Remote Destinations, starting with Cisco Unified Communication Manager Release 9.1 CSF devices can no longer register with CTI in extend mode as CTI Remote Devices and CSF devices will not be able to add Remote Destination. Interface Change No Interface changes Message Sequensce Not Applicable Backward Compatibility Application upgrades from Cisco Unified Communication Manager Release 9.0 to Release 9.1 or later results in the removal of Remote Destinations configured for CSF devices. Remote Destination Reachability Verification In Cisco Unified Communication Manager Release 9.1, an enhancement is added in CTI to verify Remote Destination reachability when it is added or updated on a CTI Remote Device. To determine if the destination is reachable, CTI performs digit analysis based on Reroute CSS configured on the CTI Remote Device. The reachability verifies that the outside dial prefix, CSS and route pattern are configured correctly. If the destination is not reachable the request returns the error: CTIERR_EXTEND_AND_CONNECT_DESTINATION_NOT_REACHABLE. Error code LINEERR_REMOTE_DESTINATION_NOT_REACHABLE – can be returned when an application attempts to add or update a Remote Destination and it cannot be reached. Interface Change No Interface changes Message Sequensce Not Applicable Backward Compatibility Backward compatibility issues may be seen when upgrading to Cisco Unified Communication Manager Release 9.1. In Unified Communication Manager Release 9.0 destination reachability was not verified and there were no errors returned. Persistent Connection Persistent connection or Persistent call refers to a call between a CTI remote device and a remote destination that stay connected even when no active customer calls exist. For example: At the beginning of the day, a Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 43 Features Supported by TSP Extend Mode Support for CSF Is Removed