The Cisco Call Manager versions 3.2 and below may restart when more than 1 gigabyte of memory is used. Sending specially crafted packets to the CCM will cause the CCM to use more than 1 gigabyte of virtual memory.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/38799/ciscoCallManager.txt
Source: https://packetstormsecurity.com/files/38799/ciscoCallManager.txt.html