First I verified the application, in my case it was a XP windows machine, I 
changed the pmtu to fixed MTU, the minimum MTU over the WAN, for other 
application and XP I fixed the timeout packet on the registry without disabled 
the Smart Defense





Ansar Mohammed <[EMAIL PROTECTED]> wrote: Hello All,
Smartdefense is dropping some of our SIP packets to/from Nortel PBX. Aside
from turning off smartdefense, are there any possible solutions?
What does smartdefense look for to determine if a sip header/packet is
invalid?
 

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