Cisco TelePresence Video Communication Server with software before X7.0.1 allows remote attackers to cause a denial of service (device crash) via a malformed SIP message, aka Bug ID CSCtr20426.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-0366
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120229-vcs