6 Mar
2023
6 Mar
'23
12:44 p.m.
Hi List
CPE behind Firewall, registering to Kamailio via TCP (or TLS).
When a call is sent to the CPE, kamailio attemts to open a new TCP
connection and is blocked by Firewall.
Is there an option to tell kamailio to use the existing registered TCP
connection?
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________
8 Mar
8 Mar
2:07 p.m.
It should automatically re-use an existing TCP connection.
Can you give an example?
What I usually see is that the CPE has REGISTERed over TCP from an
ephemeral TCP port, has given a Contact with a public port (5060,
usually), and that the INVITE has a RURI with (implicit or explicit)
port 5060 in it, which means that kamailio must attempt a new
connection (because it doesn't have an existing TCP connection to the
customer-side port 5060). Is this what's happening for you?
Perhaps you can look at the nathelper module for use of the
add_contact_alias() function. Even if this is not related to REGISTER
requests, it still might work for you.
James
On Mon, 6 Mar 2023 at 09:55, Benoit Panizzon <benoit.panizzon(a)imp.ch> wrote:
Hi List
CPE behind Firewall, registering to Kamailio via TCP (or TLS).
When a call is sent to the CPE, kamailio attemts to open a new TCP
connection and is blocked by Firewall.
Is there an option to tell kamailio to use the existing registered TCP
connection?
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________
__________________________________________________________
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9 Mar
9 Mar
10:35 a.m.
Hi James
It should automatically re-use an existing TCP
connection.
Can you give an example?
After digging more in this issue, it looks like I found the solution:
Upon successful REGISTER authentication I do:
if ($proto != 'udp') {
tcp_keepalive_enable("60", "5",
"5"); # TCP KA once per minute
tcp_set_connection_lifetime("3605"); # Live for one
hour
force_tcp_alias(); # Force traffic back on existing session
if ($avp(debug) > 0) {
xlog("L_INFO", "$cfg(route): KEEP ALIVE
engaged on $proto => ConID: $conid\n");
}
}
Especially force_tcp_alias() seems to make sure, communication TO the
CPE takes the existing TCP or TLS session towards the CPE and does not
create a new session.
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________
630
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2 comments
2 participants
participants (2)
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Benoit Panizzon -
James Browne