[sr-dev] [SR-Dev] Capture RTP packet in Kamailio module

[Alex Balashov]

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 at 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 at edvina.net>
>wrote:
>
>>
>> On 26 Mar 2014, at 08:44, Cock Ootec <cockootec at 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 at edvina.net>
>wrote:
>>
>>>
>>> On 26 Mar 2014, at 01:06, Cock Ootec <cockootec at 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.
>>> _______________________________________________
>>> sr-dev mailing list
>>> sr-dev at lists.sip-router.org
>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>>
>>>
>>>
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>>>
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>
>
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Alex Balashov - Principal 
Evariste Systems LLC
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