The SIP implementation in Cisco TelePresence TC Software 4.x and TE Software 4.x allows remote attackers to cause a denial of service (device reload) via crafted SIP packets, aka Bug ID CSCto70562.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-2206
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140430-tcte