<div dir="ltr">probably only significant to large centralized dial tone users.....<br><br>release notes<br><a href="http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/rel_notes/PCD/10_5_2/CUCM_BK_P2A4DD2C_00_pcd-rns-1052.pdf">http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/rel_notes/PCD/10_5_2/CUCM_BK_P2A4DD2C_00_pcd-rns-1052.pdf</a><br></div>