Hi,
Nicolas Olivier wrote:
Hi Bogdan,
Ok, I understand now. But I still encounter the problem because:
- rtpproxy only rewrites the c= from media part (but it should be fine
as you said) despite what a quick look in the rtpproxy code comments
say ("We have to change ports in m-lines, and also change IP addresses
in c-lines which can be placed either in session header (fallback for
all medias) or media description.")
yes, the nathelper will change the c= from session header only if it
finds a media section without a local c= (which means the default c=
from session hdr will be used).
- the centrex (which is an asterisk by the way) take only into account
the c= from the session part, not the one from media part
in the CVS devel there is a flag that force also changing of session c= :
http://openser.org/docs/modules/1.1.x/nathelper.html#AEN275 , the
"c" flag
regards,
bogdan
regards,
Nicolas
Bogdan-Andrei Iancu wrote:
Hi Nicolas,
it;s perfectly ok - see the SDP RFC : an SDP may contain a default c= in
the session part; each media section (m=) may contain an ip (c=); if it
doesn't the session c= will be used.
regards,
bogdan
Nicolas Olivier wrote:
>
> Hi,
>
> I've got a gateway which is only used for rounting and rtp proxying
> between providers and centrexes.
>
> On reply to an INVITE, one of our provider send back a "183 Session
> Progress". The problem is that in the SDP block, we've got 2 media IP
> address and rtpproxy only rewrite one.
>
> Finally, the provider establish rtp session with our gateway, and our
> centrex directly with the provider.
>
> provider gateway centrex
> 172.16.0.10 192.168.1.10 192.168.1.20
> RTP -------------> RTP ------------> RTP
> ^-------------------------------------------------|
>
> So my questions are, is it possible to have multiple IP address in
SDP
> and if so, how can I tell rtpproxy to rewrite all of them.
>
> Coming from provider:
>
> SIP/2.0 183 Session Progress.
> Via: SIP/2.0/UDP
> 192.168.1.10;branch=z9hG4bKdd67.a4cc2c44.0,SIP/2.0/UDP
> 192.168.1.20:5062;branch=z9hG4bKdd67.08f45a33.0,SIP/2.0/UDP
> 192.168.1.20:5060;branch=z9hG4bK4af242b7.
> From: "02" <sip:[EMAIL PROTECTED]>;tag=as226ce7b9.
> To: <sip:[EMAIL PROTECTED]:5062>;tag=3123AAA8-20C5.
> Date: Tue, 11 Apr 2006 09:10:29 GMT.
> Call-ID: [EMAIL PROTECTED]
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 102 INVITE.
> Allow-Events: telephone-event.
> Contact: <sip:[EMAIL PROTECTED]:5060>.
> Record-Route:
>
<sip:192.168.1.10;ftag=as226ce7b9;lr=on>,<sip:192.168.1.20:5062;ftag=as226ce7b9;lr=on>.
>
> Content-Disposition: session;handling=required.
> Content-Type: application/sdp.
> Content-Length: 261.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 3448 4768 IN IP4 172.16.0.10.
> s=SIP Call.
> c=IN IP4 172.16.0.10.
> t=0 0.
> m=audio 18322 RTP/AVP 18 101.
> c=IN IP4 172.16.0.10.
> a=rtpmap:18 G729/8000.
> a=fmtp:18 annexb=no.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-16.
>
> Forwarded to centrex:
>
> SIP/2.0 183 Session Progress.
> Via: SIP/2.0/UDP
> 192.168.1.20:5062;branch=z9hG4bK43a4.3e96aba3.0,SIP/2.0/UDP
> 192.168.1.20:5060;branch=z9hG4bK3213db83.
> From: "02" <sip:[EMAIL PROTECTED]>;tag=as1a2f900d.
> To: <sip:[EMAIL PROTECTED]:5062>;tag=3121D1B4-1BFD.
> Date: Tue, 11 Apr 2006 09:08:28 GMT.
> Call-ID: [EMAIL PROTECTED]
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 102 INVITE.
> Allow-Events: telephone-event.
> Contact: <sip:[EMAIL PROTECTED]:5060>.
> Record-Route:
>
<sip:192.168.1.10;ftag=as1a2f900d;lr=on>,<sip:192.168.1.20:5062;ftag=as1a2f900d;lr=on>.
>
> Content-Disposition: session;handling=required.
> Content-Type: application/sdp.
> Content-Length: 277.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 565 174 IN IP4 172.16.0.10.
> s=SIP Call.
> c=IN IP4 172.16.0.10.
> t=0 0.
> m=audio 36296 RTP/AVP 18 101.
> c=IN IP4 192.168.1.10.
> a=rtpmap:18 G729/8000.
> a=fmtp:18 annexb=no.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-16.
> a=nortpproxy:yes.
>
>
> openser.cfg
>
> (...)
>
> onreply_route[1] {
> if (status =~ "(180)|(183)|2[0-9][0-9]") {
> fix_nated_contact();
> if (!search("^Content-Length:[ ]*0")) {
> force_rtp_proxy();
> };
> } else if (nat_uac_test("1")) {
> fix_nated_contact();
> };
> }
>
> (...)
>
> Best regards,
> Nicolas Olivier
>
>
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