Cisco TelePresence ISDN Gateway with software before 2.2(1.92) allows remote attackers to cause a denial of service (D-channel call outage) via a crafted Q.931 STATUS message, aka Bug ID CSCui50360.
osvdb.org/102361
secunia.com/advisories/56591
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140122-isdngw
tools.cisco.com/security/center/viewAlert.x?alertId=32460
www.securityfocus.com/bid/65072
www.securitytracker.com/id/1029657
exchange.xforce.ibmcloud.com/vulnerabilities/90622