Re: [sipcore] I-DAction:draft-mohali-sipcore-reason-extension-application-01

[<[e-mail]>]

Hi Dale,

Here is a simple call flow to illustrate the example mentioned in my email (you can see 2 more examples in the I-D with Reason header inside History-Info header or NOT):

Alice calls a Toll Free Directory service to retreive a restaurant phone number in Prague. 
She is calling from a public phone using her Prepaid card.

     Alice      Prepaid service  Toll Free Directory    Restaurant
       |                |                 |                 |
       |    INVITE F1   |                 |                 |
       |--------------->|   INVITE F2     |                 |
       |                |---------------->|                 |
       |                |                 |    INVITE F3    |
       |                |                 |---------------->|  

F1: INVITE Alice -> Prepaid

INVITE sip:[e-mail];user=phone SIP/2.0
From: Alice <sip:[e-mail]>; tag=1234567
To: Prepaid service <sip:[e-mail]>
Supported: histinfo
...

F2: INVITE Prepaid -> Toll Free Directory

INVITE sip:[e-mail] SIP/2.0
From: Alice <sip:[e-mail]>; tag=1234567
To: sip:[e-mail];user=phone
Supported: histinfo
History-Info: <sip:[e-mail];user=phone?Reason=application
              %3Bcause%3D9%3B text%3D "Prepaid">;index=1
              <sip:[e-mail]>;index=1.1;mp=1
...
 
F3: INVITE Toll Free Directory -> Restaurant

INVITE sip:[e-mail] SIP/2.0
From: Alice <sip:[e-mail]>; tag=1234567
To: sip:[e-mail];user=phone
Supported: histinfo
History-Info: <sip:[e-mail];user=phone?Reason=application
              %3Bcause%3D9%3B text%3D "Prepaid">;index=1,
              <sip:[e-mail]?Reason=application
              %3Bcause%3D11%3B text%3D "Toll Free">;index=1.1;mp=1,
		  <sip:[e-mail]>index=1.1.1
...


Regards,
Marianne

> -----Message d'origine-----
> De : Worley, Dale R (Dale) [mailto:[e-mail]] 
> Envoyé : mercredi 9 mars 2011 19:32
> À : MOHALI Marianne RD-CORE-ISS; [e-mail]
> Cc : [e-mail]; [e-mail]
> Objet : RE: [sipcore] 
> I-DAction:draft-mohali-sipcore-reason-extension-application-01
> 
> ________________________________________
> From: [e-mail] 
> [[e-mail]]
> 
> > -----Message d'origine-----
> > De : Worley, Dale R (Dale) [mailto:[e-mail]]
> >
> > Could we see an example of how this is expected to be done?
> > (Or have I overlooked the example?)  There are various 
> subtlties in a 
> > protocol feature whose *absence* in the signaling tells another 
> > application that a certain action may be taken.
> 
> [MM] In my network, I have an agreement with the Prepaid 
> application that is to identify itself in the signaling (in 
> the H-I header) when applied.
> So that, I can offer to all of my clients a customized 
> service with a connection to the reseached phone number 
> except for prepaid callers.
> Callers from other networks will not be able to enjoy the 
> customized service (with the connection) as they are 
> considered as untrusted.
> _______________________________________
> 
> I was thinking of a call flow, showing the critical header 
> fields, the various proxies involved, etc.
> 
> Dale
>