4 Feb
2009
4 Feb
'09
10:22 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