16 Mar
2013
16 Mar
'13
11:01 a.m.
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 <miconda(a)gmail.com
wrote:
Hello,
On 3/6/13 1:54 PM, Khoa Pham wrote:
--
Khoa Pham
HCMC University of Science
Faculty of Information Technology
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-ge…
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 -
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