/mcpCONFERENCED call that represents the consultation call will be created on the primary line where conference parent is created. This feature should have no impact when multiple calls are joined on the same line. This feature is supported on SCCP devices that can be controlled by CTI. In addition, this feature also supports chaining of conference calls on different lines on the same device. Also, a join across line can be performed on a non-controller line; that is, the original conference controller was on a different device then where the join is being performed. This feature returns an error if one of the lines that are involved in the Join Across Lines is an intercom line. Note Backwards Compatibility This feature is backward compatible. Join Across Lines (SIP) This feature allows two or more calls on different lines of the same device to be joined by using the join operation. Applications can use the existing join API to perform the task. When the join across line happens, the consultation call on the different line on which the survival call does not reside will get cleared, and a CONFERENCED call that represents the consultation call will get created on the primary line where conference parent is created. This feature should have no impact when multiple calls are joined on the same line. This feature is supported both on SCCP and SIP devices that can be controlled by CTI. In addition, this feature also supports chaining of conference calls on different lines on the same device. Also, a join across line can be performed on a non-controller (the original conference controller was on a different device then where the join is being performed) line. This feature returns an error if one of the lines involved in the Join Across Lines is an intercom line. Interface Changes None. Message Sequences See Join Across Lines, on page 868. Backwards Compatibility This feature is backward compatible. Line-Side Phones That Run SIP TSP supports controlling and monitoring of TNP-based phones that are running SIP. Existing phones (7960 and 7940) that are running SIP cannot be controlled or monitored by the TSP and should not get included in the control list. Though the general behavior of a phone that is running is similar to a phone that is running SCCP not all TSP features get supported for phones that are running SIP. Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 75 Features Supported by TSP Join Across Lines (SIP)