Re: [Dime] Diameter basics and Apps questions

[Anders Kristensen <andersk at cisco.com>]

Inline...

Bartosz Baranowski wrote:

> Hi. I have few questions about diameter base protocol ( and overall 
> diameter ) , avp values and some app questions ( Sh interface ).
> I got through TS's and rfc but thats plain technical knowledge, no 
> examples, no place to start with.
> If someone could enlighten me i would be grateful.
>
> So here it goes.
>
> Is session always estabilished? According to TS's and rfc Session-Id is 
> required AVP, but for instance Sh messages look a lot like 
> request-reposnse oriented ( Session-Id is required AVP ) Sh doesnt have 
> any means to estabilish session. Each time server receives request it 
> checks if requesting enity has access to requested service/information.
> Or maybe session is estabilished only by sending request with session-id ??

The Session-Id is required in the messages but, I believe, is generally 
not used for anything. The client should just populate it with some 
random but valid value.

> what is corellation between header value of application Id and 
> Auth-Application-Id and Acc-Application-Id ?? And Vendor-Specific-App-Id?
> If header value of application_id is Sh# does this imply that 
> Auth-App-Id or Acc-App-id in Vendor-Spec-app-id will have Sh#  value? ( 
> Does it work the same for not grouped Auth-App-Id and Acc-App-id )

This is, in my view, a really sore point for Diameter. Specifically for 
Sh it seems pretty clear that the Sh app ID should go into both the 
message header and an Auth-Application-Id AVP within a 
Vendor-Specific-Application-Id but in general there doesn't seem to be a 
satisfying answer to your question.

Anders

> Regards
> --
> Bartosz Baranowski
>
>
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