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<DIV>----Original Message-----<BR>From: Jiang zhou [mailto:<A href="http://lists.iptel.org/mailman/listinfo/serusers">zjiang at sipod.com</A>] <BR>Sent: Thursday, September 02, 2004 6:06 PM<BR>To: Richard; <A href="http://lists.iptel.org/mailman/listinfo/serusers">serusers at iptel.org</A><BR>Subject: Re: [Serusers] User ser+nathelper+rtppoxy as outbound server<BR><BR>I think the normal Nathelper+rtpproxy will have a bug for public ua call a<BR>nated ua.<BR>ua1(pblic ip) ------->ser(nathelper+rtpproxy)----->nat----->ua2<BR><BR>ua2 can call ua1.<BR>The ua2's invite sdp can be modified by nathelper and rewrite the ip/port to<BR>rtpproxy's ip/port . So ua1 send voice to rtpproxy to ua1<BR><BR><BR>Ua1 can't call ua2.<BR>Ua1's Invite message will fail in nat_uac_test("3") test. So ser dos't<BR>setflag for this invite and don't use the rtpproxy.<BR>Ua2's reply can't be modified by nathelper. So Ua1 find the reply with a<BR>private ip.<BR>So ua2 can't send voice to ua1, only
ua1 send voice to ua2.<BR><BR>Is it right?<BR>If use a ser+rtppoxy as a outbound server, I can resovle this issue.<BR><BR></DIV>
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<DIV>I encountered into exactly the same problem: </DIV>
<DIV>UA1 ->SER->NAT->UA2</DIV>
<DIV>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.</DIV>
<DIV>Thanks a lot,</DIV>
<DIV>Tina</DIV><p>
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