Hi Laurent,

 

yes, we have tested Cisco PIX with NAT and SIP. SER works fine with our PIX installation.

 

Since there are always bugs regarding SIP , you should use the newest IOS. We are using  6.3(3)113, which version do you have? Is fixup activated with you?

 

Maybe you could send me your pix config.

 

Regards

 

yang