Re: Query regarding Owner IP in SDP field.

Hi Kevin,

Thanks for the reply.

Actually the point is that if a person is tapping the messages exchanged
between MG and MGC (unaware of the Call processing requirements outlined at
MGC), then just by looking at these messages what is the way of
differentiating between Call Transfer and Call Conference?

I understand that whenever a MODIFY request with SDP in remote desciptor is
recieved (for a Ephemeral termination whose Remote is alreday set) then
either Transfer or Conference is taking place, but still not do know which
service exactly and how to find out and differentiate.

Between MG2 and MGC (as per the call flows), using Notify event this can be
done:
      a)Flash followed by On Hook for Transfer
      b)Flash follwoed by Flash for Conference
But how between MG1 and MGC or MG3 and MGC?

Also, if anyone has the link of latest draft for MEGACO Call Flows, then
please share with me the same.

Thanks and Regards,
Nupur Gupta
Software Engineer
Aricent Technologies ltd.



On Mon, Dec 15, 2008 at 6:10 PM, Kevin Boyle <[email protected]> wrote:

> Last I checked, the draft you reference has been expired for 3.5 years.  I
> wouldn't put much stock in expired drafts.
>
> As for conference vs. transfer, there are specific call processing
> requirements for each outlined by the various regional SDOs.  These call
> processing requirements are carried out, and billed for, by the MGC.  Since
> the MG should just do what it is commanded by the MGC and has little to no
> call processing knowledge, why does it need to know whether a particular
> manipulation is any particular feature?
>
> Kevin
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf
> Of
> nupur gupta
> Sent: Monday, December 15, 2008 5:50 AM
> To: [email protected]
> Subject: [Megaco] Query regarding Owner IP in SDP field.
>
> Hi All,
>
> Referring to the call flow examples, for Call Transfer and Call Conference,
> given in the following:
> http://tools.ietf.org/html/draft-ietf-megaco-callflows-04
>
> As far as my understanding goes, the only way to differentiate between Call
> Transfer and Call Conference at MG1/MG3 is to analyze the Owner IP field in
> SDP part of MODIFY message (Step 37 and step 39, Sec 8.1).
> If the owner IP received in SDP in Modify is same as previously received
> owner IP, then it is Call Conference else it Call Transfer.
>
> How ever, as per RFC3525, the owner IP field is optional and hence not
> necessarily present in the SDP part.
> So what is other way (and may be more concrete approach) to distinguish
> between Call Transfer and Call conference at MG1 and MG3?
>
> Thanks and Regards,
> Nupur Gupta,
> Software Engineer,
> Aricent technologies ltd.
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>
>

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