1 Apr
2014
1 Apr
'14
6:32 p.m.
Hi guys, sorry for bothering you with silly questions.
I am working on school project and I'd like to process the RTP in Kamailio
directly. I have manage to use subst_body() and fix_nated_sdp() to force
RTP to be sent to my Kamailio (ip and port of my Kamailio server). I have
recompiled Kamailio module topoh to print incomming and outgoing messages
but I don't see any RTP messages. I also set sanity_checks to 0 so I can
see raw data but no success there.
Can you please point me what module is processing the message first. I
hoped that it would be topoh module but clearly I was wrong. I would like
to get to this packet as soon as it arieves to Kamailio so I can work with
it.
Is this even possible or the core of the Kamailio rejects the message
before it is sent to any module? Is there any way to register to the first
callback of the core so i can get unfiltered network traffic?
Thanks in advance
On Wed, Mar 26, 2014 at 3:18 PM, Alex Balashov <abalashov(a)evaristesys.com>wrote;wrote:
No. You can't route the RTP and RTCP traffic to
Kamailio, by definition.
You keep asking questions that betray a lack of basic understanding of SIP
network elements. I think you should take Olle's suggestion and learn how
it works.
On 26 March 2014 04:21:08 GMT-04:00, Cock Ootec <cockootec(a)gmail.com>
wrote:
Ok so if I explicitly route all my VoIP traffic (SIP, RTP, RTCP) to
Kamailio I can distinguish the streams (parse packets, edit packets) and
for example forward these streams to different ports? Thats perfect. Thanks
for all your responses they helped much.
On Wed, Mar 26, 2014 at 8:56 AM, Olle E. Johansson <oej(a)edvina.net>wrote;wrote:
--
Sent from my mobile, and thus lacking in the refinement one might expect
from a fully fledged keyboard.
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0671
Web: http://www.evaristesys.com/, http://www.alexbalashov.com
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On 26 Mar 2014, at 08:44, Cock Ootec <cockootec(a)gmail.com> wrote:
Thanks for your quick reply. So, Kamailio does nothing with RTP/RTCP
packets? I think I understand (now when I think about it) - Kamailio only
handles SIP messages by which in nested SDP two endpoints negotiate the
stream where media will go through?
Yes, that is how the SIP protocol works. Please update yourself on the
protocol which Kamailio is built around.
So RTP/RTCP media stream flow directly between two UA endpoints and
Kamailio has nothing to do with handling of these packets. Could you,
please confirm my thoughts?
Yes.
All right but what if for example we have special UA that sends to
Kamailio specially modified packet (non standard SIP). In my extension of
topoh module I have sanity_checks disabled so will Kamailio check this
packet before my module and drops it or I can receive, modify and forward
this packet? I mean modify this packet to standard SIP packet and forward
it to another UA. I am just asking theoretically because in the moment I
cant try this.
You can modify as much as you want.
/O
On Wed, Mar 26, 2014 at 7:41 AM, Olle E. Johansson <oej(a)edvina.net>wrote;wrote:
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On 26 Mar 2014, at 01:06, Cock Ootec <cockootec(a)gmail.com> wrote:
Hi,
I'd like to develop module for Kamailio which will be working with
RTP/RTCP packets. Is there any way to capture and edit RTP packet in module
of Kamailio for example in module extended from *topoh*?
Kamailio in itself is a SIP server, often acting as a SIP proxy. The
SIP protocol doesn't handle media, it facilitates setup and management of a
media session. Adding a module for handling media in Kamailio doesn't
really make any sense.
We do have modules that talk to external media servers. Look into those
- like rtpproxy. The Kamailio module itself does not handle media, but
communicates with the other server that in fact manages media relaying.
Before you modify software, you need to understand the architecture :-)
/O
In topoh there are two events SREV_NET_DATA_IN and SREV_NET_DATA_OUT but
I didn't be able to capture any RTP packets by them.
Thanks in advance for any help or useful information.
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