5 Feb
2014
5 Feb
'14
8:54 a.m.
Dear list,
I'm having a problem.
I have an SBC server with two network interfaces, one external IP
(X.X.248.194) and other internal IP (X.X.248.21). Messages are sent to the
proxy sip server through internal ip with this configuration:
route [sip-serverr] {
rewritehostport ("ip_sip_proxy: 5060");
force_send_socket (X.X.248.21: 5060);
t_relay ();
exit;
}
When a UA sends an INVITE to the SBC, the responses (back) to UA are being
sent with the correct external source IP (X.X.248.194) but if there are
retransmissions of these responses, after 6 seconds, the source IP changes
to the internal ip (X.X.248.21)
Does anyone from the list know how I can solve this?
Thanks,
Regards,
--
Diego
5 Feb
5 Feb
12:47 p.m.
I am a bit confused. I suspect with SBC you mean the Kamailio proxy?
On 05.02.2014 14:54, Diego Alejandro Ozuna Escalada wrote:
When a UA sends an INVITE to the SBC, the responses (back) to UA are
being sent with the correct external source IP (X.X.248.194) but if
there are retransmissions of these responses, after 6 seconds, the
source IP changes to the internal ip (X.X.248.21)
Are you sure it is a retransmission, or maybe it is a new branch of an
existing transaction, e.g. triggered by a failure route? You can differ
them by different branch id in the topmost Via header (carefully check
the last character). If it is really due to a new branch created in a
failure route, make sure to force the send socket also in the failure route.
PS: If you have a nice working IP setup, e.g. one external interface
(used by the default route) and one internal interface (a different
subnet, dedicated routes for the internal network) then you could just
set mhomed=1 in kamailio.cfg and Kamailio can automatically always
select the correct send-socket.
regards
Klaus
6 Feb
6 Feb
1:21 p.m.
Thanks por the reply,
it's like you suspect, in this scenario the kamailio proxy do some SBC
functions.
I'm doing tests with mhomed parameter. I'll do a feedback after these tests.
regards.
Diego
2014-02-05 14:47 GMT-03:00 Klaus Darilion <klaus.mailinglists(a)pernau.at>at>:
I am a bit confused. I suspect with SBC you mean the
Kamailio proxy?
On 05.02.2014 14:54, Diego Alejandro Ozuna Escalada wrote:
When a UA sends an INVITE to the SBC, the responses (back) to UA are
being sent with the correct external source IP (X.X.248.194) but if
there are retransmissions of these responses, after 6 seconds, the
source IP changes to the internal ip (X.X.248.21)
Are you sure it is a retransmission, or maybe it is a new branch of an
existing transaction, e.g. triggered by a failure route? You can differ
them by different branch id in the topmost Via header (carefully check the
last character). If it is really due to a new branch created in a failure
route, make sure to force the send socket also in the failure route.
PS: If you have a nice working IP setup, e.g. one external interface (used
by the default route) and one internal interface (a different subnet,
dedicated routes for the internal network) then you could just set mhomed=1
in kamailio.cfg and Kamailio can automatically always select the correct
send-socket.
regards
Klaus
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2 comments
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participants (2)
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Diego Alejandro Ozuna Escalada -
Klaus Darilion