/mcpApplications that support this behavior are must add call observer on the terminal or add call observers on all addresses on the terminal. Since consult call is created on the next available addresses, exceptions are thrown to consult requests if call observers are not added to all addresses. Join across lines must be enabled on Cisco Unified IP Phone 6900 Series to successfully complete conferences from applications. Cisco Unified Communications Manager Release 8.6, JTAPI supports multiple calls per line configuration on Cisco Unified IP Phone 69xx series. Prior to Release 8.6, Cisco Unified IP Phone 69xx series supported only one call per line, where Maximum Number of Calls/Busy Trigger defined for a line (MNC/BT) cannot exceed 2/1. With multiple calls per line, Cisco Unified IP Phone 69xx series supports more than one call per line, and MNC/BT is configured to values greater than 2/1. Outbound Rollover Behavior for 69xx Phones With MNC/BT configured as 2/1, When a second call is initiated from a line, the new call will be created on (rollover to) the second line. Cisco Unified Communications Manager Release 8.6 supports outbound rollover. If MNC is greater than 2, there can be multiple calls on the line before the rollover occurs. For both Cisco Unified Communications Manager Release 8.5 and 8.6, the outbound rollover occurs if MNC-1 calls are active on the line. Outbound Rollover is supported only on the endpoints. Using the JTAPI application, you can make MNC calls for a line; however, rollover will not happen at MNC-1, even if a second line exists). Interface Changes See CiscoProviderCapabilities, on page 504 and CiscoProviderCapabilityChangedEv, on page 506 Message Sequences See Support for Cisco Unified IP Phone 6900 Series, on page 1236 Backward Compatibility This feature is backward compatible. Support for 100+ Directory Numbers This feature enables users to have more than 100 Directory Numbers associated with a Device (Phones, CTI Ports and Route Points). JTAPI supports this feature and displays the corresponding addresses on the terminal to the application. Interface Changes There are no interface changes. Message Sequences There are no message sequences. Backward Compatibility This feature is backward compatible. Cisco Unified JTAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 185 Features Supported by Cisco Unified JTAPI Support for 100+ Directory Numbers