Unspecified vulnerability in Cisco IOS CallManager Express (CME) allows remote attackers to gain sensitive information (user names) from the Session Initiation Protocol (SIP) user directory via certain SIP messages, aka bug CSCse92417.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28185
http://www.vupen.com/english/advisories/2006/3126
http://www.securityfocus.com/bid/19309
http://www.cisco.com/warp/public/707/cisco-sr-20060802-sip.shtml
http://www.blackhat.com/html/bh-usa-06/bh-usa-06-speakers.html#Endler