Hi Daniel, thanks for the response 2. Change the c= line to a.b.c.d .In the document, a.b.c.d is the public IP of the client !!!! so in this case not using rtpproxy 3. I read that Kamailio use rtpproxy when client is NATed. Does Kamailio detect NAT in REGISTER or INVITE message ?
I think this problem is very important but unfortunately, it lacks document :( On Mon, Mar 11, 2013 at 7:52 PM, Daniel-Constantin Mierla <mico...@gmail.com > wrote: > Hello, > > > On 3/6/13 1:54 PM, Khoa Pham wrote: > >> Hi, >> >> After asking many questions, I haven't got any clues about how Kamailio >> handles INVITE message by default, in terms of modifying c= line in SDP >> >> According to rtpproxy flow http://kamailio.org/docs/ser-** >> getting-started/SER-**GettingStarted.pdf<http://kamailio.org/docs/ser-getting-started/SER-GettingStarted.pdf> >> >> When client register, SIP proxy will call nat_uac_test() to detected if >> client is NATed or not, then save this info. >> >> When client A calls client B, the INVITE message will go through SIP >> proxy. Here the SIP proxy can do 3 things (as in section "INVITEs behind >> NAT" in the pdf). >> >> 1. Add an SDP command direction:active to the SDP content >> 2. Change the c= line to a.b.c.d >> 3. Force RTP to go through a proxy by changing the c-line to c=IN IP4 >> address-of-proxy and the m-line to >> m=audio port-on-proxy RTP/AVP 0 101. >> >> When will SER do 2, 3 ? >> > 2 and 3 are done usually when using rtpproxy to relay rtp packets (e.g., > via rtpproxy_manage() function), or using various functions related to sdp > updating from nathelper/rtpproxy/siputils or mangler module. > > Cheers, > Daniel > > -- > Daniel-Constantin Mierla - http://www.asipto.com > http://twitter.com/#!/miconda - > http://www.linkedin.com/in/**miconda<http://www.linkedin.com/in/miconda> > Kamailio World Conference, April 16-17, 2013, Berlin > - http://conference.kamailio.com - > > > ______________________________**_________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users@lists.sip-router.org > http://lists.sip-router.org/**cgi-bin/mailman/listinfo/sr-**users<http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users> > -- Khoa Pham HCMC University of Science Faculty of Information Technology
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