Cisco TelePresence ISDN Gateway contains a vulnerability that could allow an unauthenticated, remote attacker to trigger the drop of the data channel (D-channel),
causing all calls to be terminated and preventing users from making new
calls.

Cisco has released free software updates that address this vulnerability. No workarounds that mitigate this vulnerability are available.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140122-isdngw

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