[Serusers] NAT & RTPPRoxy

Jiri Kuthan jiri at iptel.org
Fri Sep 5 03:49:50 CEST 2003


At 12:14 PM 9/3/2003, Gary Brewer wrote:
>Thanks Jan,
>
>I should have made myself a little bit clearer; I am using the RTC 1.2 API
>(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rtcclnt/rt
>c/real_time_communications_rtc_client_start_page.asp)
>
>What I find the most interesting is -
>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rtcclnt/rtc
>/traversal_of_upnp_enabled_nats.asp specifically the last sentence of the
>third paragraph. Why I can't provide it my external IP address and port on
>the NAT is annoying! I wonder if it would be possible to modify the REGISTER
>message on the way to the SIP server and change the IP:Port to my external
>NAT address mapping - or get NATHelper to do this for me.

That's exactly what nathelper does with fix_contacts (or something like that).
You need to make sure that you apply it to REGISTER of UACs, who receive 
others' requests at the same address from which they send theirs.Otherwise, the external address
taken from singaling's transport is useless.

-Jiri 




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