[Serusers] Is RTPproxy needed even when there is a Cisco PIX?

Klaus Darilion klaus.mailinglists at pernau.at
Thu Jul 13 13:01:25 CEST 2006

Ricardo Carvalho wrote:
> Hi,
> I'm deploying a VoIP server using SER and I would like to know if I need 
> to install RTPproxy (or Mediaproxy), because the network where the 
> server will be placed already has a Cisco PIX 515E which has this 
> feature that analyses headers of SIP messages and I suppose that 
> rewrites them to avoid NAT problems.

The Cisco PIx helps you in rewriting SIP messages if your SIP proxy is 
behind NAT - that means if your Cisco-PIX network uses NAT, the Cisco 
PIX provide means to solve this NAT issue.

But I do not know if it is capable of "far end NAT traversal".


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