4 Jul
2013
4 Jul
'13
12:30 p.m.
Hello,
Which module can I use to have Kamailio generate a CANCEL request when it receives a
certain reply code? I want to cancel a dialog when Kamailio receives a 181 Call
Forwarded.
4 Jul
4 Jul
12:32 p.m.
Kamailio is a proxy, and not designed to originate requests.
If you really, really want to generate a request, you can use
uac_req_send():
http://kamailio.org/docs/modules/4.0.x/modules/uac.html#idp1686632
But, you'll have to spoof all the parameters, including the pertinent
branch ID, From tag and CSeq, correctly. I'm not sure if $uac_req(...)
lets you do that.
This is a very bad idea. CANCELs -- like most requests -- are for user
agents to send, not proxies.
-- Alex
On 07/04/2013 03:30 AM, Grant Bagdasarian wrote:
Hello,
Which module can I use to have Kamailio generate a CANCEL request when
it receives a certain reply code? I want to cancel a dialog when
Kamailio receives a 181 Call Forwarded.
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
12:42 p.m.
Ohh, that's gonna be tricky then.
Well, the thing is we want to do some kind of answer machine detection by catching the 181
SIP responses and CANCEL the dialogs. I've tested this with one of our suppliers and
for the most mobile operators in this country a 181 response is given when the call is
being forwarded to voicemail. For our purpose this covers roughly about 90% of all the
calls. I know there are modules available for Asterisk and FreeSwitch which do AMD, but
those consume too much resources.
-----Original Message-----
From: sr-users-bounces(a)lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org]
On Behalf Of Alex Balashov
Sent: Thursday, July 4, 2013 9:33 AM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Sending CANCEL
Kamailio is a proxy, and not designed to originate requests.
If you really, really want to generate a request, you can use
uac_req_send():
http://kamailio.org/docs/modules/4.0.x/modules/uac.html#idp1686632
But, you'll have to spoof all the parameters, including the pertinent branch ID, From
tag and CSeq, correctly. I'm not sure if $uac_req(...) lets you do that.
This is a very bad idea. CANCELs -- like most requests -- are for user agents to send,
not proxies.
-- Alex
On 07/04/2013 03:30 AM, Grant Bagdasarian wrote:
Hello,
Which module can I use to have Kamailio generate a CANCEL request when
it receives a certain reply code? I want to cancel a dialog when
Kamailio receives a 181 Call Forwarded.
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
list sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
12:43 p.m.
On 07/04/2013 03:42 AM, Grant Bagdasarian wrote:
Ohh, that's gonna be tricky then.
Turns out it won't. Olle posted the correct solution. I was unaware of
the tentacles TMX had been growing. :-)
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
12:45 p.m.
4 jul 2013 kl. 09:32 skrev Alex Balashov <abalashov(a)evaristesys.com>om>:
Kamailio is a proxy, and not designed to originate
requests.
If you really, really want to generate a request, you can use uac_req_send():
http://kamailio.org/docs/modules/4.0.x/modules/uac.html#idp1686632
But, you'll have to spoof all the parameters, including the pertinent branch ID, From
tag and CSeq, correctly. I'm not sure if $uac_req(...) lets you do that.
This is a very bad idea. CANCELs -- like most requests -- are for user agents to send,
not proxies.
Alex,
Who sends a CANCEL on a fork? ;-)
That's the proxy's job.
(Sorry could not resist)
But you are right that if you cancel ALL branches in the proxy so that the UA suddenly
gets a 487 and is not aware of the CANCEL that can be
messy.
/O
12:46 p.m.
On 07/04/2013 03:45 AM, Olle E. Johansson wrote:
Alex,
Who sends a CANCEL on a fork? ;-)
That's the proxy's job.
(Sorry could not resist)
Yes, but that's part of "automatic" branch control as part of normal
forking implementation.
When I said that, what I meant is that this sort of explicit
pseudo-third party call control is not a proxy's job, methodologically
speaking. :-)
-- Alex
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
12:51 p.m.
4 jul 2013 kl. 09:46 skrev Alex Balashov <abalashov(a)evaristesys.com>om>:
On 07/04/2013 03:45 AM, Olle E. Johansson wrote:
I do agree.
Kamailio has grown to be able to run in proxy mode as well as a
pseudo-third-party-call-control-beast ;-)
The important thing is that you know which mode you run it in and why.
Our marketing dept like to describe Kamailio as a "SIP Server" nowadays, not
just a "SIP proxy".
/O
Alex,
Who sends a CANCEL on a fork? ;-)
That's the proxy's job.
(Sorry could not resist)
Yes, but that's part of "automatic" branch control as part of normal
forking implementation.
When I said that, what I meant is that this sort of explicit pseudo-third party call
control is not a proxy's job, methodologically speaking. :-)
12:53 p.m.
On 07/04/2013 03:51 AM, Olle E. Johansson wrote:
Our marketing dept like to describe Kamailio as a
"SIP Server"
nowadays, not just a "SIP proxy".
Yeah, I know. But when I actually come out and say that, people rise in
righteous indignation from their cream chicken and demand to know why it
can't play messages, initiate calls, and host conferences. :-)
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
12:57 p.m.
4 jul 2013 kl. 09:53 skrev Alex Balashov <abalashov(a)evaristesys.com>om>:
On 07/04/2013 03:51 AM, Olle E. Johansson wrote:
Hmm. I will forward this feedback to the Martini-drinking guys in the marketing dept.
Maybe a hostile takeover of SEMS or another media server would be the right way to go, or
just write better copy.
/O
Our marketing dept like to describe Kamailio as a
"SIP Server"
nowadays, not just a "SIP proxy".
Yeah, I know. But when I actually come out and say that, people rise in righteous
indignation from their cream chicken and demand to know why it can't play messages,
initiate calls, and host conferences. :-)
12:58 p.m.
So if I use the t_cancel_callid function, Kamailio sends a CANCEL to the UAS, but
doesn't send anything to the UAC? Or do I need to handle that myself?
-----Original Message-----
From: sr-users-bounces(a)lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org]
On Behalf Of Olle E. Johansson
Sent: Thursday, July 4, 2013 9:45 AM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Sending CANCEL
4 jul 2013 kl. 09:32 skrev Alex Balashov <abalashov(a)evaristesys.com>om>:
Kamailio is a proxy, and not designed to originate
requests.
If you really, really want to generate a request, you can use uac_req_send():
http://kamailio.org/docs/modules/4.0.x/modules/uac.html#idp1686632
But, you'll have to spoof all the parameters, including the pertinent branch ID, From
tag and CSeq, correctly. I'm not sure if $uac_req(...) lets you do that.
This is a very bad idea. CANCELs -- like most requests -- are for user agents to send,
not proxies.
Alex,
Who sends a CANCEL on a fork? ;-)
That's the proxy's job.
(Sorry could not resist)
But you are right that if you cancel ALL branches in the proxy so that the UA suddenly
gets a 487 and is not aware of the CANCEL that can be messy.
/O
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
1:03 p.m.
4 jul 2013 kl. 09:58 skrev Grant Bagdasarian <GB(a)cm.nl>nl>:
So if I use the t_cancel_callid function, Kamailio
sends a CANCEL to the UAS, but doesn't send anything to the UAC? Or do I need to
handle that myself?
The UAS that receives the CANCEL will send a 200 Ok on the
Cancel that you need NOT to forward to the UA.
At the same time it will send a 487 Request terminated that you WILL HAVE TO forward to
the UAC so that it closes the transaction. Unless you have other
branches, then you will have to swallow the 487 too.
I haven't tested this function so I don't know which parts of this that happens
automagically in TM in the transaction context. I would assume that the 200 OK
is handled properly and the 487 is forwarded only if there are not other branches that
hasn't received a final response. This you will have to test. I would
be happy if you report your findings back to the list!
/O
-----Original Message-----
From: sr-users-bounces(a)lists.sip-router.org
[mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Olle E. Johansson
Sent: Thursday, July 4, 2013 9:45 AM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Sending CANCEL
4 jul 2013 kl. 09:32 skrev Alex Balashov <abalashov(a)evaristesys.com>om>:
Kamailio is a proxy, and not designed to
originate requests.
If you really, really want to generate a request, you can use uac_req_send():
http://kamailio.org/docs/modules/4.0.x/modules/uac.html#idp1686632
But, you'll have to spoof all the parameters, including the pertinent branch ID, From
tag and CSeq, correctly. I'm not sure if $uac_req(...) lets you do that.
This is a very bad idea. CANCELs -- like most requests -- are for user agents to send,
not proxies.
Alex,
Who sends a CANCEL on a fork? ;-)
That's the proxy's job.
(Sorry could not resist)
But you are right that if you cancel ALL branches in the proxy so that the UA suddenly
gets a 487 and is not aware of the CANCEL that can be messy.
/O
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
1:04 p.m.
On 07/04/2013 04:03 AM, Olle E. Johansson wrote:
I haven't tested this function so I don't know
which parts of this
that happens automagically in TM in the transaction context. I would
assume that the 200 OK is handled properly and the 487 is forwarded
only if there are not other branches that hasn't received a final
response. This you will have to test. I would be happy if you report
your findings back to the list!
This is what I had in mind when I said this was a bad idea. I still
think it's likely to result in a complete mess, nice TM function or not.
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
1:09 p.m.
Will do. I'm not forking the INVITE, so there will only be a single branch.
-----Original Message-----
From: sr-users-bounces(a)lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org]
On Behalf Of Olle E. Johansson
Sent: Thursday, July 4, 2013 10:04 AM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Sending CANCEL
4 jul 2013 kl. 09:58 skrev Grant Bagdasarian <GB(a)cm.nl>nl>:
So if I use the t_cancel_callid function, Kamailio
sends a CANCEL to the UAS, but doesn't send anything to the UAC? Or do I need to
handle that myself?
The UAS that receives the CANCEL will send a 200 Ok on the
Cancel that you need NOT to forward to the UA.
At the same time it will send a 487 Request terminated that you WILL HAVE TO forward to
the UAC so that it closes the transaction. Unless you have other branches, then you will
have to swallow the 487 too.
I haven't tested this function so I don't know which parts of this that happens
automagically in TM in the transaction context. I would assume that the 200 OK is handled
properly and the 487 is forwarded only if there are not other branches that hasn't
received a final response. This you will have to test. I would be happy if you report your
findings back to the list!
/O
-----Original Message-----
From: sr-users-bounces(a)lists.sip-router.org
[mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Olle E.
Johansson
Sent: Thursday, July 4, 2013 9:45 AM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Sending CANCEL
4 jul 2013 kl. 09:32 skrev Alex Balashov <abalashov(a)evaristesys.com>om>:
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
Kamailio is a proxy, and not designed to
originate requests.
If you really, really want to generate a request, you can use uac_req_send():
http://kamailio.org/docs/modules/4.0.x/modules/uac.html#idp1686632
But, you'll have to spoof all the parameters, including the pertinent branch ID, From
tag and CSeq, correctly. I'm not sure if $uac_req(...) lets you do that.
This is a very bad idea. CANCELs -- like most requests -- are for user agents to send,
not proxies.
Alex,
Who sends a CANCEL on a fork? ;-)
That's the proxy's job.
(Sorry could not resist)
But you are right that if you cancel ALL branches in the proxy so that the UA suddenly
gets a 487 and is not aware of the CANCEL that can be messy.
/O
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
list sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
list sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
12:41 p.m.
4 jul 2013 kl. 09:30 skrev Grant Bagdasarian <GB(a)cm.nl>nl>:
Hello,
Which module can I use to have Kamailio generate a CANCEL request when it receives a
certain reply code? I want to cancel a dialog when Kamailio receives a 181 Call Forwarded.
The TMX module has two functions you can use
http://kamailio.org/docs/modules/4.0.x/modules/tmx.html#idm7888
/O
12:43 p.m.
On 07/04/2013 03:41 AM, Olle E. Johansson wrote:
4 jul 2013 kl. 09:30 skrev Grant Bagdasarian <GB(a)cm.nl <mailto:GB@cm.nl>>:
Ah, interesting. Who knew!
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
Hello,
Which module can I use to have Kamailio generate a CANCEL request when
it receives a certain reply code? I want to cancel a dialog when
Kamailio receives a 181 Call Forwarded.
The TMX module has two functions you can use
http://kamailio.org/docs/modules/4.0.x/modules/tmx.html#idm7888
12:43 p.m.
Yeah, that's pretty awesome :D
Thanks Olle!
-----Original Message-----
From: sr-users-bounces(a)lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org]
On Behalf Of Alex Balashov
Sent: Thursday, July 4, 2013 9:43 AM
To: sr-users(a)lists.sip-router.org
Subject: Re: [SR-Users] Sending CANCEL
On 07/04/2013 03:41 AM, Olle E. Johansson wrote:
4 jul 2013 kl. 09:30 skrev Grant Bagdasarian <GB(a)cm.nl <mailto:GB@cm.nl>>:
Ah, interesting. Who knew!
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
Hello,
Which module can I use to have Kamailio generate a CANCEL request
when it receives a certain reply code? I want to cancel a dialog when
Kamailio receives a 181 Call Forwarded.
The TMX module has two functions you can use
http://kamailio.org/docs/modules/4.0.x/modules/tmx.html#idm7888 
12:52 p.m.
On Thursday 04 July 2013 09:30:21 Grant Bagdasarian wrote:
Which module can I use to have Kamailio generate a
CANCEL request when it
receives a certain reply code? I want to cancel a dialog
when Kamailio
receives a 181 Call Forwarded.
Kamailio 1.5x. had this possibility. unfortunately, it got lost in the merger
with SER's tm module. A resurrection of this function would be very welcome.
http://www.kamailio.org/docs/modules/1.5.x/tm.html#id2492468
--
Alex Hermann
12:55 p.m.
On 7/4/13 9:52 AM, Alex Hermann wrote:
On Thursday 04 July 2013 09:30:21 Grant Bagdasarian
wrote:
It was not lost:
http://www.kamailio.org/docs/modules/4.0.x/modules/tmx.html#idp2473632
Cheers,
Daniel
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Which module can I use to have Kamailio generate
a CANCEL request when it
receives a certain reply code? I want to cancel a dialog
when Kamailio
receives a 181 Call Forwarded.
Kamailio 1.5x. had this possibility. unfortunately, it got lost in the merger
with SER's tm module. A resurrection of this function would be very welcome.
http://www.kamailio.org/docs/modules/1.5.x/tm.html#id2492468
12:59 p.m.
On Thursday 04 July 2013 09:55:12 Daniel-Constantin Mierla wrote:
On 7/4/13 9:52 AM, Alex Hermann wrote:
> On Thursday 04 July 2013 09:30:21 Grant Bagdasarian wrote:
>> Which module can I use to have Kamailio generate a CANCEL request when it
> receives a certain reply code? I want to cancel a dialog when Kamailio
> receives a 181 Call Forwarded.
>
> Kamailio 1.5x. had this possibility. unfortunately, it got lost in the
merger
> with SER's tm module. A resurrection of this
function would be very
welcome.
I forgot about tmx, luckily the function is still available.
--
Alex Hermann
12:55 p.m.
4 jul 2013 kl. 09:52 skrev Alex Hermann <alex(a)speakup.nl>nl>:
On Thursday 04 July 2013 09:30:21 Grant Bagdasarian
wrote:
Functions that existed in Kamailio but not SER was moved to TMX,
which is where you look for the old goodies.
The Corex, TMX and KEX modules are similar in that regards.
Take some time to investigate them and find your friends from
Kamailio.
http://kamailio.org/docs/modules/4.0.x/
/O
Which module can I use to have Kamailio generate
a CANCEL request when it
receives a certain reply code? I want to cancel a dialog
when Kamailio
receives a 181 Call Forwarded.
Kamailio 1.5x. had this possibility. unfortunately, it got lost in the merger
with SER's tm module. A resurrection of this function would be very welcome.
http://www.kamailio.org/docs/modules/1.5.x/tm.html#id2492468
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19 comments
5 participants
participants (5)
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Alex Balashov -
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Daniel-Constantin Mierla -
Grant Bagdasarian -
Olle E. Johansson