8 Sep
2023
8 Sep
'23
5:45 p.m.
Hi all
Is there a way to skip a branch in branch route?
Situation: Two registrar server with DMQ synced location database.
CPE register via TCP or TLS. To properly work, message have to be sent
over the existing TCP connection.
Multiple CPE register to one AOR.
CPE1 and CPE2 register to Registrar 1
CPE3 registers to Registrar 2
On Registrar 1 there is an established TCP connection to CPE1 and CPE2
but not to CPE3.
Within the Branch Route to the CPE I can check if there is a TCP
as the Branch Route is executed for every contact in that AOR:
branch_route[BR_TO_CPE]
{
[...]
$var(reg_contact_addr) = $(ulc(aor=>addr)[$T_branch_idx]{uri.host});
$var(socket) = $(ulc(aor=>socket)[$T_branch_idx]);
if ($var(socket) == 0) {
xlog("L_ERROR", "$cfg(route): No Socket for:
$var(reg_contact_addr)");
}
[...]
}
This log an error if the socket is not present on the local registrar.
But is there a way to tell kamailio to skip/discard that contact?
My intention is to parallel branch from the core to both registrars,
that way all contacts would still get the call but via established
TCP socket (and in case of UDP and NAT via correct know ip for ALG port-forwarding).
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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 Sep
8 Sep
7:01 p.m.
Hi
https://www.kamailio.org/wiki/cookbooks/devel/pseudovariables#branch_name_-…
Assigning $null to uri attribute will drop the branch, for the rest of
attributes will just set the value to null.
I fear this does not work within branch_route
if ($var(socket) == 0) {
if ($avp(debug) > 0) {
xlog("L_INFO", "$cfg(route):
$(branch(uri)[$T_branch_idx]) via Socket: $var(socket) is NOT LOCAL to this Registrar -
dropping!\n");
}
$(branch(uri)[$T_branch_idx]) = $null;
}
Result:
* Call is still branched to CPE
* $(branch(uri)[$T_branch_idx]) is null on all subsequent branches after the first one.
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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
______________________________________________________
7:35 p.m.
You also can filter it in the request route and not create branch wich
doesn't belong this server ( you can achieve that by verifying ucl variable
details), or making it UDP branch being forwarded to proper server which
handles the particular connection.
On Fri, 8 Sept 2023, 11:29 Benoît Panizzon, <benoit.panizzon(a)imp.ch> wrote:
Hi
https://www.kamailio.org/wiki/cookbooks/devel/pseudovariables#branch_name_-…
Assigning $null to uri attribute will drop the branch, for the rest of
attributes will just set the value to null.
I fear this does not work within branch_route
if ($var(socket) == 0) {
if ($avp(debug) > 0) {
xlog("L_INFO", "$cfg(route):
$(branch(uri)[$T_branch_idx]) via Socket: $var(socket) is NOT LOCAL to this
Registrar - dropping!\n");
}
$(branch(uri)[$T_branch_idx]) = $null;
}
Result:
* Call is still branched to CPE
* $(branch(uri)[$T_branch_idx]) is null on all subsequent branches after
the first one.
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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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10:03 p.m.
Hi Yuriy
You also can filter it in the request route and not
create branch wich
doesn't belong this server ( you can achieve that by verifying ucl
variable details), or making it UDP branch being forwarded to proper
server which handles the particular connection.
I have started trying to solve this in request route.
I'm still truggling on how to distinguish local and non local
registrations.
I have 4 CPE registered to the same AOR.
kamclt ul show [AOR] does show they are registered. 3 on the local
registrar (with a socket) and one with socket [not set].
If I repeat on the other registrar I get matching information. One with
a socket, the other three are [not set].
So trying to understand the hard way, what happens:
$var(i)=0;
while($var(i)<=$branch(count))
{
$var(socket) = $(ulc(aor=>socket)[$var(i)]);
xlog("L_INFO", "$cfg(route): DEBUG BEFORE: IDX: $var(i)
TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n");
$var(i) = $var(i) + 1;
}
$var(i)=0;
while($var(i)<=$branch(count))
{
$var(socket) = $(ulc(aor=>socket)[$var(i)]);
xlog("L_INFO", "$cfg(route): DEBUG REMOVE: IDX: $var(i)
TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n");
if ($var(socket) == 0) {
xlog("L_INFO", "$cfg(route): Dropping Branch IDX
$var(i) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n");
$(branch(uri)[$var(i)]) = $null;
} else {
$var(i) = $var(i) + 1; # do NOT increment index as the branches
got renumbered.
}
}
$var(i)=0;
while($var(i)<=$branch(count))
{
$var(socket) = $(ulc(aor=>socket)[$var(i)]);
xlog("L_INFO", "$cfg(route): DEBUG AFTER: IDX: $var(i)
TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n");
$var(i) = $var(i) + 1;
}
What I did not yet understand.
$branch(count) is 3 !
So, does kamailio only consider the 3 registrations WITH a socket?
Or is this the index starting with 0, thus 4 contacts?
When I do $(branch(uri)[$var(i)]) = $null; then $branch(count) is decremented. I suppose
because the next contact takes that index, this is why I do NOT increment $var(i).
But I then get no $(branch(uri)[$var(i)]) on the highest index, suggesting that I only see
3 contacts, not all 4 of them.
Indeed, my 'BEFORE' loop did not output the contact registered on the other
registrar.
So WHY is there still the INVITE being sent to the fourth, non local contact?
=> Confused!
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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
______________________________________________________
10:43 p.m.
Main request is the first branch.
So consider changed $ru after lookup as the first (0) branch.
Other branches will be appended as addition.
On Fri, 8 Sept 2023, 14:03 Benoît Panizzon, <benoit.panizzon(a)imp.ch> wrote:
Hi Yuriy
You also can filter it in the request route and
not create branch wich
doesn't belong this server ( you can achieve that by verifying ucl
variable details), or making it UDP branch being forwarded to proper
server which handles the particular connection.
I have started trying to solve this in request route.
I'm still truggling on how to distinguish local and non local
registrations.
I have 4 CPE registered to the same AOR.
kamclt ul show [AOR] does show they are registered. 3 on the local
registrar (with a socket) and one with socket [not set].
If I repeat on the other registrar I get matching information. One with
a socket, the other three are [not set].
So trying to understand the hard way, what happens:
$var(i)=0;
while($var(i)<=$branch(count))
{
$var(socket) = $(ulc(aor=>socket)[$var(i)]);
xlog("L_INFO", "$cfg(route): DEBUG BEFORE: IDX: $var(i)
TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n");
$var(i) = $var(i) + 1;
}
$var(i)=0;
while($var(i)<=$branch(count))
{
$var(socket) = $(ulc(aor=>socket)[$var(i)]);
xlog("L_INFO", "$cfg(route): DEBUG REMOVE: IDX: $var(i)
TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n");
if ($var(socket) == 0) {
xlog("L_INFO", "$cfg(route): Dropping Branch IDX
$var(i) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n");
$(branch(uri)[$var(i)]) = $null;
} else {
$var(i) = $var(i) + 1; # do NOT increment index as
the branches got renumbered.
}
}
$var(i)=0;
while($var(i)<=$branch(count))
{
$var(socket) = $(ulc(aor=>socket)[$var(i)]);
xlog("L_INFO", "$cfg(route): DEBUG AFTER: IDX: $var(i)
TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n");
$var(i) = $var(i) + 1;
}
What I did not yet understand.
$branch(count) is 3 !
So, does kamailio only consider the 3 registrations WITH a socket?
Or is this the index starting with 0, thus 4 contacts?
When I do $(branch(uri)[$var(i)]) = $null; then $branch(count) is
decremented. I suppose because the next contact takes that index, this is
why I do NOT increment $var(i).
But I then get no $(branch(uri)[$var(i)]) on the highest index, suggesting
that I only see 3 contacts, not all 4 of them.
Indeed, my 'BEFORE' loop did not output the contact registered on the
other registrar.
So WHY is there still the INVITE being sent to the fourth, non local
contact?
=> Confused!
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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
______________________________________________________
11:22 p.m.
Hi Yuriy
Main request is the first branch.
So consider changed $ru after lookup as the first (0) branch.
Other branches will be appended as addition.
Not sure if I understood that correctly...
while in request route... the four URI of the branches are:
$branch(uri)
$(branch(uri)[0])
$(branch(uri)[1])
$(branch(uri)[2])
and $branch(count) is 3 because there are 3 'additional' branches?
How do I geht the sockets of those four branches?
$branch(uri) => $(ulc(aor=>socket)[0])
$(branch(uri)[0]) => $(ulc(aor=>socket)[1])
and so on? Indexes offset by 1?
And, what happens if I set:
$branch(uri) = $null
will $(branch(uri)[0]) become $branch(uri) and eveything shift one
index down?
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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
______________________________________________________
11:35 p.m.
$branch(uri)
$(branch(uri)[0])
Nah, just tested, both contain the same branch...
I discovered $branch(send_socket)...
Still not understanding, why I clearly have 4 contacts registerd on the
AOR but only finding 3 of them when looping through the branches but
when route(RELAY) is called, all 4 get traffic.
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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
______________________________________________________
11:46 p.m.
In your case, I would use
https://www.kamailio.org/docs/modules/5.6.x/modules/registrar#registrar.f.r…
See example:
https://www.kamailio.org/docs/modules/5.6.x/modules/registrar#idm871
You can iterate over it
Then for the first entry, you can set $ru and $du variables and it will
become the main branch
For the other do append_branch and set parameters of the branch[-1]
accordingly.
So you can control branch creation instead of automatically doing it by
Kamailio and filter all needed.
9 Sep
9 Sep
12:22 a.m.
Hi Yuriy
Then for the first entry, you can set $ru and $du
variables and it
will become the main branch
For the other do append_branch and set parameters of the branch[-1]
accordingly.
So you can control branch creation instead of automatically doing it
by Kamailio and filter all needed.
Thank you, I think you pointed me in the right direction.
So going to replace:
if (lookup("location", "$var(lookupuri)")) {
by
if (reg_fetch_contacts("location", "$var(lookupuri)",
"aor")) {
Then iterate the contacts and only add the ones having a socket set.
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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
______________________________________________________
1:32 a.m.
Hi Yuriy
This looks promising. I was able to set $ru and then add branches to
only send the calls from the registrar with a valid socket.
But I fear: append_branch($(ulc(aor=>addr)[$var(i)])) is not correct
in NAT situation.
aor=>received is probably the one to use, but does not contain the
username part. And also I probably lost that full NAT automation.
I also observed that the sending socket is not preserved. In my case I
have to tcp sockets: 8080 where I run the xhttp api, not used for sip,
and 5060. The outgoing call originates from 8080. So it is definitely
not reusing the existing TCP connection.
Do I have to set $fs? But how do I set this only for a specific branch?
Assume I have multiple contacts, some using TCP other UDP or TLS.
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
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
______________________________________________________
3:15 a.m.
The branch RURI is quite clear I suppose but
For the NAT solving you should pass received set into
$(branch(dst_uri)[-1]) or $du for main brach
Send socket also can be set via $(branch(send_socket)[-1]) or $fs
respectively.
TCP can create new transactions, as UA can wait for incoming requests on
different ports, which is announced in the Contact Header,
However, you may try to use the tcp_keepalive_enable() and tcp_set_alias()
functions when a TCP connection is established to mediate over it if UA
supports this way of interaction.
пт, 8 сент. 2023 г. в 17:32, Benoît Panizzon <benoit.panizzon(a)imp.ch>ch>:
Hi Yuriy
This looks promising. I was able to set $ru and then add branches to
only send the calls from the registrar with a valid socket.
But I fear: append_branch($(ulc(aor=>addr)[$var(i)])) is not correct
in NAT situation.
aor=>received is probably the one to use, but does not contain the
username part. And also I probably lost that full NAT automation.
I also observed that the sending socket is not preserved. In my case I
have to tcp sockets: 8080 where I run the xhttp api, not used for sip,
and 5060. The outgoing call originates from 8080. So it is definitely
not reusing the existing TCP connection.
Do I have to set $fs? But how do I set this only for a specific branch?
Assume I have multiple contacts, some using TCP other UDP or TLS.
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________
12 Sep
12 Sep
12:07 a.m.
Hi Yuriy
I fear I still need some help
What I am doing now is:
if(reg_fetch_contacts("location", "$var(lookupuri)",
"aor")) {
t_newtran();
xlog("L_INFO","$cfg(route): Existing registration contacts
count: $(ulc(aor=>count))\n");
$var(i) = 0; # Location Contact Index
$var(c) = 0; # Valid Contact count
while($var(i) < $(ulc(aor=>count))) {
xlog("L_INFO","$cfg(route): $var(i):
Contact-Address: $(ulc(aor=>addr)[$var(i)]) Socket: $(ulc(aor=>socket)[$var(i)]) RU:
$ru\n");
if ($(ulc(aor=>socket)[$var(i)]) == 0) {
xlog("L_INFO","$cfg(route): $var(i): NO
SOCKET\n");
} else {
if ($var(c) == 0) {
$ru = $(ulc(aor=>addr)[$var(i)]);
$du = $(ulc(aor=>received)[$var(i)]); # NAT
$fs = $(ulc(aor=>socket)[$var(i)]);
$var(c) = $var(c) + 1;
} else {
append_branch($(ulc(aor=>addr)[$var(i)]));
$(branch(uri)[-1]) =
$(ulc(aor=>received)[$var(i)]); # NAT?
$(branch(send_socket)[-1]) =
$(ulc(aor=>socket)[$var(i)]);
$var(c) = $var(c) + 1;
}
}
$var(i) = $var(i) + 1;
}
if ($var(c) == 0) {
xlog("L_INFO","$cfg(route): We have $var(c) local
contacts! Reject\n");
send_reply("480", "Not local contact found");
exit;
}
xlog("L_INFO","$cfg(route): We have $var(c) local
contacts!\n");
} else {
xlog("L_INFO","$cfg(route): We have contact at
all!\n");
send_reply("480", "No registered");
exit;
}
t_on_branch("BR_TO_CPE");
t_on_failure("LOCATION_MANAGE_FAILURE");
route(RELAY);
exit;
When I look at the trace:
R-URI contains the user@ip:port from the location record. So each device different.
But all requests are sent to only one device! (probably $du as set on the first match)
branch_route[BR_TO_CPE]
{
if ($avp(debug) > 0) {
xlog("L_INFO", "$cfg(route): BR_idx: $T_branch_idx
$avp(from_in) => $avp(destination) (Contact: $rU)\n");
}
$var(useragent) = $(ulc(aor=>user_agent)[$T_branch_idx]);
$var(reg_contact_addr) = $(ulc(aor=>addr)[$T_branch_idx]{uri.host});
$var(socket) = $(ulc(aor=>socket)[$T_branch_idx]);
if ($avp(debug) > 1) {
xlog("L_INFO", "$cfg(route): $(branch(uri)[$T_branch_idx])
via socket: $var(socket)\n");
}
}
On $T_branch_idx == 0 everything looks fine.
R-URI is correct, INVITE is sent to correct distination ip and port previsouly set.
On $T_branch_idx == 1 things stuff is wrong.
$(branch(uri)[$T_branch_idx]) returns <null>
R-URI contains the received URI without Username (which is what I set above)
But the request is sent to the same ip and destination as branch 0.
So I guess I mixed up $du and received.
Does $branch(dst_uri) correspond to $du?
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
______________________________________________________
12:23 a.m.
$(branch(dst_uri)[-1]) = $(ulc(aor=>received)[$var(i)]);
seems to be correct.
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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12 comments
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participants (2)
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Benoît Panizzon -
Yuriy G