19 Aug
2015
19 Aug
'15
3:28 p.m.
Hi,
Is there a way to change the ports were RTPproxy sends outgoing packets
? By rewriting the SDP before it gets to RTPproxy, or anything else ?
1 - Kamailio receives the SDP
2 - It somehow transmits the contact information to RTPproxy (ip + ports)
3 - The client start sending packets to RTPproxy which in turn relays
them to the contact
How to change the ports in step 2 ?
Sincerely,
--
*Jean-Marie Baran*
19 Aug
19 Aug
5:02 p.m.
Hi Jean,
Can you further explain your question, the steps you mentioend are already
handled by kamailio's module rtpproxy. Now, you mentioned change the SDP in
kamailio before rtpproxy function is called....I wonder how the device
would feel about it.
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 ?!
Kindly explain the whole scenario.
BR,
Sammy
On Wed, Aug 19, 2015 at 8:28 AM, Jean-Marie Baran <jean-marie.baran(a)ama.bzh>
wrote:
Hi,
Is there a way to change the ports were RTPproxy sends outgoing packets ?
By rewriting the SDP before it gets to RTPproxy, or anything else ?
1 - Kamailio receives the SDP
2 - It somehow transmits the contact information to RTPproxy (ip + ports)
3 - The client start sending packets to RTPproxy which in turn relays them
to the contact
How to change the ports in step 2 ?
Sincerely,
--
*Jean-Marie Baran*
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5:29 p.m.
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*
3386
days inactive
3386
days old
2 comments
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participants (2)
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Jean-Marie Baran -
SamyGo