2 Feb
2018
2 Feb
'18
3:49 p.m.
Hi Timmo,
We do have *enable_double_rr* set to 1 but the route set added by the
proxy when record_route() on the INVITE consists in a single route. This
is because Alice and Bob are BOTH registered with the alternate port
5066 on the same interfacec and using the same protocol (UDP). To us,
this seems logical.
Do you have a double route in your case even though both party are on
the same port, same interface and both UDP? If so, could you send us an
exemple of Route: header?
Emmanuel BUU
IVèS
Le 2018-02-02 à 14:18, Timmo Verlaan a écrit :
Hi Thomas,
We have a similar situation but we use double route headers so the
correct egress socket is chosen. You can enable this by setting a
modparam: enable_double_rr.
Would this be a solution for you?
Kind regards,
Timmo Verlaan
On 2 Feb 2018 13:57, "Thomas Carvello" <thomas.carvello(a)ives.fr
<mailto:thomas.carvello@ives.fr>> wrote:
Thank you for you answer.
We have tried to change the local port for Bob, but it doesnt
change anything. And the contact value in 200 OK message has no
influence in this case.
In fact, we have made a further investigation regarding the socket
selection *and read the code. *The issue seems to be located in
the RR module and the loose_route() function.
In the after_loose() function in loose.c, the function
set_force_socket() is called only if a DOUBLE route is mentioned
in the route set of the ACK message
But when both users are using 5066 as proxy port, we get only ONE
route for the proxy in the route set (and to us it is OK). In this
case, we get a trace:
"No next URI found"
and the code exits. Later in the message processing, when
t_relay() is called, the forward_request() selects the first
socket defined in our configuration instead.
At this point, we can't presume what socket we be select. We
believe that it is a software bug and that after_loose() should
force the send_socket even though we have only one route in the
route set. We also checked the 5.1 code and there is no change in
this module that would alter this behavior.
Are we missing something?
Thank you for you time,
Thomas
Le 26/01/2018 à 15:43, Евгений Голей a écrit :
Hi
Could it be because of Bob happend to use 5060 as local port?
Yes, the port and the address in the ACK are indicated by what
the value in Contact was in reply 200 Ok. Look at the message 200 Ok
Четверг, 25 января 2018, 13:00 +03:00 от Thomas Carvello
<thomas.carvello(a)ives.fr> <mailto:thomas.carvello@ives.fr>:
Hello,
i have an issue with my Kamailio 4.1.9 configuration.
This configuration is multi-homed, we have*two network*
interfaces, one on a private network and on the public
Internet. Kamailio is configured to listen on port 5060 and
5066 on both interfaces. We register two users Alice and Bob
on the public Internet using port 5066. Both users are
behind a NAT and we capture the SIP exchange on the proxy server.
We have set the parameter mhomed=1
When Alice calls Bob, we have
Alice Proxy Bob
src=5063 dst=5066
INVITE ------------------>
src=5066
------ INVITE ---------------> dst=5060
dst=5066
<------- 200 OK -------------- src=5060
dst=5063
<------- 200 OK --------- src=5066
src=5063 dst=5066
-------- ACK ----------->
*src=5060 (blocked by NAT)*
------ ACK-----x dst=5060
The ACK packet gets relayed with the wrong source port. Then
the NAT rejects the packet and the call cannot be established.
For some reason, when Bob calls Alice, the call is correctly
established. Could it be because Bob happend to use 5060 as
local port?
Also, if we set nhomed=0 it works BUT we are not sure that
multi homed is handled correctly.
I was wondering if you have encounter this issue before?
I have investigated the code for selection socket and what is
the logic of this selection ?
/*How does kamailo knows that it should choose 5066 as src
port if the user is registered using port 5066 instead of 5066?*
/
Thank you for your time.
Thomas
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Best
Evgeniy
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