28 Oct
2005
28 Oct
'05
1:28 p.m.
reInvites are handled at the end of route block
if(method=="INVITE") {
setflag(6);
route(1);
break;
}
however this problem has been resolved now. force_rtp_proxy required "r"
as an option. which forces to trust/use ip:port in sdp.
Thank you for your help and participation.
Atif
On Fri, 2005-10-28 at 06:45 +0200, Greger V. Teigre wrote:
A reINVITE will be caught here in your config:
if (loose_route()) {
t_relay();
};
For example see onsip.org NAT mediaproxy script for an example of handling
reINVITEs:
if (loose_route()) {
if (has_totag() && (method=="INVITE" || method=="ACK")) {
if (client_nat_test("3") || search("^Route:.*;nat=yes")) {
setflag(6);
use_media_proxy();
};
};
route(1);
break;
};
nat=yes is set by record_routing.
g-)
----- Original Message -----
From: "Atif Rasheed" <atif(a)burraqtel.com.pk>
To: "Greger V. Teigre" <greger(a)teigre.com>
Cc: <serusers(a)lists.iptel.org>
Sent: Thursday, October 27, 2005 09:39 AM
Subject: Re: [Serusers] ser-rtpproxy bridge mode and T38
okey, I got your point that it was difficult to
understand. but please
tell me know if you understood this setup now or should I elaborate
little more.
As far as ReInvites are concerned I think they are handled properly.
Please go through the attached ethereal trace, You will see SIP
signalling is properly handled. ser.cfg is also attached with the email
MG(10.0.3.13)------->(10.0.2.14)SSW------->10.0.2.99(ser/rtpproxy)80.255.40.70
ser/rtpproxy machine is with two i.e. private and public interfaces.
> >
I have read in RtpProxy that RtpProxy waits for both parties to send
> > atleast one udp packet and then it fills up both ip:port structures
> > associated with that call and then it starts relaying.
>
> Yes, this is to ensure that the proxy can get through the NATs.
>
> > Call Setup is like this:
> > --------Media----->
> > A-Party ----->MG-------->SSW------>SER/RtpProxy------->B-Party
> >
> > now only B-Party is sending UDP Packets and Ser/RtpProxy sends them
> > to
> > SSW (signalling entity) instead of MediaGateway. As soon as RtpProxy
> > receives one udp packet from A-Party then it sends those RTP packets
> > to
> > MG i.e. it starts relaying following the right path.
> > how I can solve this ???
>
> I'm afraid I'm not capable of understanding what you are saying here.
> You
> have SSW in the media path? Or are you trying to show both media and
> signalling path in the same picture? What is really the priblem?
> rtpproxy
> will only do what you tell it to (using force_rtp_proxy).
I am trying to show media and signalling path in the same picture.
I'm sure you understand that it is difficult for others to understand?
Is this confirm that RtpProxy will handle T38 or
we also need to handle
T38 in a special way. because as I described below paragraph that after
reinvite B-Party stopped RTP and started T38 packets in the same
session
but RtpProxy failed to send to the right recepient.
It's not T38 that needs special handling, but as I said, the reINVITE.
g-)
>
> > Adding to this, now after RTP relay starts successfully. B-Party (if
> > Dialed number is a FAX) reinvites with T38 and the IP:Port info in
> > SDP
> > remains same. Now somehow RtpProxy is not recognizing the T38
> > packets
> > becuase we are in the same session and RtpProxy start sending those
> > T38 packets to SSW (signalling entity) instead of sending to MG.
> > Please
> > remember we are in the same session, and RtpProxy shud send these
> > T38
> > packets to MG, as it was sending RTP packets before ReInvite.
> >
> > is it a bug in RTPProxy, should I use MediaProxy instead ???
>
> You need to handle reINVITEs in a special way. Look at the Getting
> Started
> scripts (and document) from onsip.org for how to do it both for
> rtpproxy
> and
> mediaproxy.
>
> g-)
>
>