[SIPForum-discussion] SIP using NAT

Krishna Kishore G gkittu at gmail.com
Tue Feb 27 14:31:28 UTC 2007

     To use the SIP Server which is behind NAT,  two things has to be done
 1. SIP server should have NATed IP address, in the router the inter
IP should have this configuration

2. The Router should  have the knowledge of SIP to give you the
Application Layer Gateway(ALG) functionality
     I  think this will solve the problem.


On 2/23/07, alexander.mosso at nekotec.com.mx
<alexander.mosso at nekotec.com.mx> wrote:
> Greetings.
> I have a SIP server behind NAT and I want extern SIP phones to use it. Everything works fine with internal phones.
> I need to know exaclty how does it works... what parameters do I have to change in the headers and SDP content.
> Does anyone have or know a good document whit this information?
> Thanks in advance.
> John.
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Thanks &regards
G.Krishna Kishore

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