Hi All,
This is with reference to the mail I wrote yesterday. Kindly read the
scenario explained below and please comment on my understanding / questions.
Also, let me ask my main question again , with reference to
'draft-ietf-sipping-dialog-package-00':
Following is quoted from the above mentioned package :
------------------------
Abstract
This document defines a dialog event package for the SIP Events
architecture, along with a data format used in notifications for this
package. The dialog package allows users to subscribe to another user, and
receive notifications about the changes in state of INVITE initiated dialogs
that the user is involved in.
------------------------
Can I use this package to receive notification for INVITE initiated dialogs
that the initiator is not invo,ved in ( by using "REFER; method = INVITE") ?
If not this way then is there some other way , using SIP, in which a
controller(e.g. App Server) is allowed to have monitoring session with a
switching entity (softswitch) for calls which are actually maintained by the
switch but are also monitored for call processing events by the App Server ?
Kindly do comment...
regards
Himanshoo
----- Original Message -----
From: "Himanshoo" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Tuesday, September 24, 2002 10:20 AM
Subject: [Sip] certain questions on third party call control ...
> Hi,
>
> I have certain questions related to the scenario explained below. In
> addition to the questions, can somebody please also comment if my
> understanding is correct:
>
> SCENARIO
> -------------
> Caller first dials a service access number and therefore call is given to
> the App Server by switch :
>
> Caller --(INVITE)--> Switch--(INVITE)--> App Server
>
> After this App Server Invites Media Server into the call and collects the
> destination number to which caller wants to talk to .
>
> After getting the destination number , App Server would request the switch
> to connect caller to destination number . But Application Server would
> always like to monitor the call progress (e.g. is and when call was
> answered/terminated/media characteristics changed). So finally it will be
> like this:
>
> App Server
>
> ^
> | (Monitoring Link)
>
> Caller----> Switch ----->Destination
>
>
> App server acts as controller . After playing the prompt to user, it
> collects digits from user and then it has to connect caller to the called
> party. Now I donot want the to develop a module on App Server, which
> connects two parties in a call, because softswitch already knows how to do
> it.. SO I use REFER (with refer-to field = Destination Number) to ask
switch
> to connect caller to the destination number, and automatically I am
> subscriber for progress of the INVITE which is used to INVITE the
> destination number . In additon I need the following:
>
> 1. Capability to do Remote Hang UP : My controller should be able to
> terminate call to the destination if the call duration exceeds 'allowed
> time'. Can I do this using 'REFER ;method = BYE' ?
> 2. After initiating the dialog using 'REFER; method = INVITE', I also need
> to know the progress of dialog. For example if either of caller and called
> party hangsup, I need to stop billing. In other words, I want to subscribe
> for the state of dialogs involving softswitch and Calling/Called Party.
> First I want to know whether I can do this by sending a SUBSCRIBE , using
> dialog package 'draft-ietf-sipping-dialog-package-00.txt'?
> Also, I want to know whether the dailog state information as per
> 'draft-ietf-sipping-dialog-package-00.txt' can also notify me of changes
in
> media characteristics (i.e. SDP for the dialog).?
> 3. Further in another scenario, if the time allowed for the calling user
> (i.e. pre-paid user) expires, and if I want to connect hm to a Media
Server
> for playing some prompt (to decide future course of action) , then can I
do
> this by sending 'REFER ; method = BYE for the dialog between softswitch
and
> called party' and then send 'REFER; method=INVITE for connecting to MRS;
In
> this case if I want to tell MRS to send the digits to APP server, instead
of
> switch , how do I do that?
>
>
> Best Regards
> Himanshoo
>
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