Going back to my original question then, under the premise that fixup is disabled, should this scenario work correctly....

Is is possible to have a SIP UA behind nat and communicate to an OpenSER/RTP Proxy server behind a different nat and have everything transverse appropriately?  Or will I need something additional like STUN?

Example:

OpenSER / RTP Proxy / Asterisk will all reside on the same machine.

SIP UA -> Cisco PIX ( Public IP to Localnet NAT ) -> OpenSER/RTP -> Asterisk


Jeremy McNamara wrote: 
Patrick Baker wrote:
  
I was under the impression that the Cisco fixup protocols broke the SIP 
headers
  
    


My experience is the same, with all ALGs.   For some reason whenever an 
ALG tries to 'fix' the headers, they end up fixing it the wrong way, 
thus breaking things even more.




Jeremy McNamara


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