[Sip-implementors] A call with some of the control removed from the 2 talking parties
Ramon F Herrera
telephony at jonjay.com
Sat Sep 24 18:58:20 EDT 2005
Dear SIP experts:
I have an application in mind, and this SIP implementors list is probably
one of the best places to ask for the help I need.
My application is very similar to a "click to dial" app.
What I would like to provide to my users is as follows. They will be
reading a PDF document (using Acrobat, of course) and the document will
contain some lines like: "If you need more information, dial (xxx) xxx-xxxx".
The user will click on top of such lines, and then is when the application
After doing some research I found some names that apply to the
functionality that I am looking for. The possible names are:
- TBCT: Two B-Channel Transfer
- RLT: Release Line Trunking
- Call Deflection
- Third Party Call Control or 3PCC <-- probably the best match
The application will initiate 2 calls: one to the remote phone highlighted
in the PDF page, and another to the extension of the phone on the user's desk.
Next the application will bridge the 2 calls without waiting for answers on
either end and finish (presumably during call progress). Notice that the
application must not be involved whatsoever in the actual voice call.
It will exit as soon as technically possible.
I have 2 candidates to make the actual bridge: a Cisco AS-5300 and an
That's all I have for now. I would like to start with some software
already written (sipXpbx or sipXphone come to mind).
Is the SIP protocol able to handle calls like that in which both ends
are the receiver of the call?
Thanks for your kind and expert assistance in pointing me in what to do next.
-Ramon F Herrera
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