[SR-Users] Change ports for outgoing RTP packets in RTPproxy

[Jean-Marie Baran]

On 19/08/2015 16:02, SamyGo wrote:
>
> For example UA sent and INVITE/SDP saying I'm listening on port 54321 
> ; you modify it to 12345 in kamailio and then call manage_rtpproxy() 
> function. After 200OK RTPproxy will try to send RTPs to 12345 port but 
> nothing may be possibly there ?!
>

Yes, that is exactly what I want. The fact is that I am dealing with a 
SIP server which has an odd behaviour that I cannot change. There is a 
router between this server and mine. But this router is actually 
listening on a single port, even so the SIP server behind wants to be 
contacted on two RTP ports:

Client: "I want ports 23404 and 25300" -----> SIP server: "Fine, I relay 
23404 and 25300" -----> Router: "I don't care, it will be 12345 and 
nothing else" -----> (Internet) -----> Kamailio: "Okay, he wants ports 
23404 and 25300"

But it seems that if I send the packets to the router port (12345 in my 
example):
1 - they will be correctly forwarded to the SIP server
2 - the SIP server is somehow capable of relaying to the client's 
correct ports

I think that this behaviour can be assimilated to a dysfunction, but I 
have no grasp on it − this is the reason of this workaround −
Hence my question: is it possible to "modify it to 12345 in kamailio and 
then call manage_rtpproxy() function", as you said ?

Thanks !

On a side note, "Jean-Marie" is my first-name, and "Jean" is… well an 
incomplete part of my first-name. Yes, we have complicated names here in 
France :)

-- 
*Jean-Marie Baran*
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