4 Feb
2009
4 Feb
'09
2:20 p.m.
Hello,
during the week before freezing the code for release kamailio (openser)
1.5.0, I have added several enhancements to the dialog module. I am
going to present them in several emails, as I get the documentation
properly updated.
There is now a new function called dlg_bridge(From, To, outbound_proxy).
It can be used to connect From and To users. The mechanism is a simple
call transfer scenario.
kamailio => INVITE (hold) =>From
kamailio <= 200ok <= From
kamailio => REFER (To) =>From
kamailio <= 200ok <= From
...
From => INVITE ... =>To
...
kamailio => BYE =>From
kamailio <= 200ok <= From
The function can be called from configuration file or via MI interface.
It opens the door for several cute features you can do with the sip
server. Here are couple of usage examples:
- easy integration with web/external applications for Click-To-Dial.
Doing it with kamctl will look loke:
kamctl fifo dlg_bridge sip:from@kamailio.org sip:to@kamailio.org
- wake up/reminder/scheduled call - use rtimer module to run scheduled
calls - you can connect your user to a media server playing a message,
to a conference room or where the user sets its preference
- call again - when a user is calling a busy destination, when that
destination becomes available, the server can initiate the call to
connect the caller with the destination
Documentation is available at:
http://kamailio.org/docs/modules/1.5.x/dialog.html
Cheers,
Daniel
--
Daniel-Constantin Mierla
http://www.asipto.com
4 Feb
4 Feb
6:18 p.m.
2009/2/4 Daniel-Constantin Mierla <miconda(a)gmail.com>om>:
There is now a new function called dlg_bridge(From,
To, outbound_proxy).
It can be used to connect From and To users. The mechanism is a simple
call transfer scenario.
kamailio => INVITE (hold) =>From
kamailio <= 200ok <= From
kamailio => REFER (To) =>From
kamailio <= 200ok <= From
...
From => INVITE ... =>To
...
kamailio => BYE =>From
kamailio <= 200ok <= From
Hi Daniel, this seems to imitate the mechanism in RFC 3725 (Third
Party Call Control).
Have you considered using initial REFER? It's widely *not* supported
by common phones, but it would be a first step to improve SIP world :)
Please read the thread I opened some days ago about "Initial REFER vs
RFC 3725 (Third Party Call Control)" in SIP-Implementors:
https://lists.cs.columbia.edu/pipermail/sip-implementors/2009-January/02148…
Of course, initial REFER wouldn't work in most of the cases, but I
have a "custom" solution:
REFER initial-dialog is much cleaner than INVITE of 3PCC, but it's
usually not allowed by common phones. So a PBX or
SIP server implementing click2dial could try first a REFER
initial-request, and in case it receives a negative response (i.e.
"403 Forbidden" or "501 Not Implemented") the the server could use
the
3PCC INVITE.
BTW I'm trying to convince some vendors (softphones basically) to
allow initial REFER (asking permission for the phone user, of course).
:)
Regards.
--
Iñaki Baz Castillo
<ibc(a)aliax.net>
7:22 p.m.
Hi Inaki,
On 02/04/2009 06:18 PM, Iñaki Baz Castillo wrote:
2009/2/4 Daniel-Constantin Mierla
<miconda(a)gmail.com>om>:
right. There is a script in examples directory, that could be used to
initiate via MI, however, that is heavy. This new option is one step
command. Moreover you can do it from config file, e.g., you can get a
sip options with some special headers and kamailio/openser will connect
the users.
There is now a new function called
dlg_bridge(From, To, outbound_proxy).
It can be used to connect From and To users. The mechanism is a simple
call transfer scenario.
kamailio => INVITE (hold) =>From
kamailio <= 200ok <= From
kamailio => REFER (To) =>From
kamailio <= 200ok <= From
...
From => INVITE ... =>To
...
kamailio => BYE =>From
kamailio <= 200ok <= From
Hi Daniel, this seems to imitate the mechanism in RFC 3725 (Third
Party Call Control).
Have you considered using initial REFER? It's
widely *not* supported
by common phones, but it would be a first step to improve SIP world :)
You can do initial refer with uac_req_send(). Do you see a potential
issue doing so?
http://kamailio.org/docs/modules/1.5.x/uac.html#id2467913
Please read the thread I opened some days ago about
"Initial REFER vs
RFC 3725 (Third Party Call Control)" in SIP-Implementors:
https://lists.cs.columbia.edu/pipermail/sip-implementors/2009-January/02148…
Of course, initial REFER wouldn't work in most of the cases, but I
have a "custom" solution:
REFER initial-dialog is much cleaner than INVITE of 3PCC, but it's
usually not allowed by common phones. So a PBX or
SIP server implementing click2dial could try first a REFER
initial-request, and in case it receives a negative response (i.e.
"403 Forbidden" or "501 Not Implemented") the the server could use
the
3PCC INVITE.
You can do it with kamailio/openser - uac module first, then dialog module.
The admin can even build a list of devices supporting first or second
option.
BTW I'm trying to convince some vendors
(softphones basically) to
allow initial REFER (asking permission for the phone user, of course).
:)
good luck!
Cheers,
Daniel
--
Daniel-Constantin Mierla
http://www.asipto.com
9:34 p.m.
El Miércoles, 4 de Febrero de 2009, Daniel-Constantin Mierla escribió:
Great :)
--
Iñaki Baz Castillo
REFER
initial-dialog is much cleaner than INVITE of 3PCC, but it's
usually not allowed by common phones. So a PBX or
SIP server implementing click2dial could try first a REFER
initial-request, and in case it receives a negative response (i.e.
"403 Forbidden" or "501 Not Implemented") the the server could use
the
3PCC INVITE.
You can do it with kamailio/openser - uac module first, then dialog module.
The admin can even build a list of devices supporting first or second
option.
10:40 p.m.
On 02/04/2009 09:34 PM, Iñaki Baz Castillo wrote:
El Miércoles, 4 de Febrero de 2009, Daniel-Constantin
Mierla escribió:
Great :)
with the mention that if you want to do via MI, then the right modules
are tm (for sending single request) and dialog.
Cheers,
Daniel
--
Daniel-Constantin Mierla
http://www.asipto.com
REFER
initial-dialog is much cleaner than INVITE of 3PCC, but it's
usually not allowed by common phones. So a PBX or
SIP server implementing click2dial could try first a REFER
initial-request, and in case it receives a negative response (i.e.
"403 Forbidden" or "501 Not Implemented") the the server could use
the
3PCC INVITE.
You can do it with kamailio/openser - uac module first, then dialog
module.
The admin can even build a list of devices supporting first or second
option.
5772
days inactive
5772
days old
4 comments
2 participants
participants (2)
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Daniel-Constantin Mierla -
Iñaki Baz Castillo