This indicates an attack attempt against a Memory Corruption vulnerability in OfficeSIP Server.
The vulnerability is caused by an error when handling malformed SIP INVITE messages. It allows a remote attacker to crash vulnerable systems by sending a crafted SIP INVITE message.
OfficeSIP Communications OfficeSIP Server 3.1
System Compromise: Remote attackers can crash vulnerable systems.
Currently we are not aware of any vendor supplied patch for this issue.