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----Original Message-----
From: Jiang zhou [mailto:zjiang at sipod.com]
Sent: Thursday, September 02, 2004 6:06 PM
To: Richard; serusers at iptel.org
Subject: Re: [Serusers] User ser+nathelper+rtppoxy as outbound server

I think the normal Nathelper+rtpproxy will have a bug for public ua call a
nated ua.
ua1(pblic ip) ------->ser(nathelper+rtpproxy)----->nat----->ua2

ua2 can call ua1.
The ua2's invite sdp can be modified by nathelper and rewrite the ip/port to
rtpproxy's ip/port . So ua1 send voice to rtpproxy to ua1


Ua1 can't call ua2.
Ua1's Invite message will fail in  nat_uac_test("3") test. So ser dos't
setflag for this invite and don't use the rtpproxy.
Ua2's reply can't be modified by nathelper. So Ua1 find the reply with a
private ip.
So ua2 can't send voice to ua1, only ua1 send voice to ua2.

Is it right?
If use a ser+rtppoxy as a outbound server, I can resovle this issue.

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I encountered into exactly the same problem:

UA1 ->SER->NAT->UA2

nathelper does not forces RTP relay upon INVITE (because there is no need), and 200 OK SDP won't be rewrited (lookup mode). Help me please whether I can resolve this problem in configuration file.

Thanks a lot,

Tina