/mcpDescription Service Parameters This parameter defines a number, up to 8 digits (e.g. 0001), that is prefixed to a conference identifier generated for Adhoc and Meet-Me conferences that will be hosted on a SIP conference bridge such as Cisco Telepresence MCU or Cisco Telepresence Conductor. This field should be populated by the administrator when there are multiple clusters in a network that will be sharing the SIP conference bridges that Unified Communications Manager manages. Every cluster should be configured with a unique prefix to ensure that the conference identifier for Adhoc and Meet-Me conferences is unique. If conference resources are not being shared across clusters, then this field may not be populated. Cluster Conferencing Prefix Identifier Configure Join Across Lines The Join Across Lines feature allows a user to join calls on multiple phone lines (either on different directory numbers or on the same directory number but on different partitions) to create a conference. Before you begin • Ensure the phone model supports Join Across Lines Generate a Phone Feature List, on page 5 • Configure Ad Hoc Conferencing, on page 223 Procedure Step 1 From Cisco Unified CM Administration, choose Device > Device Settings > Default Device Profile. The Default Device Profile Configuration window is displayed. Step 2 From the Device Profile Type drop-down list, choose the phone model. Step 3 From the Device Protocol drop-down list, choose the relevant SCCP or SIP protocol. Step 4 Set the Join Across Lines to On. Step 5 Click Save. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 227 Conferencing Features Configure Join Across Lines