Re: [sipcore] Does SIP support "Reverse Charging" function?

P-Charging-Vector and P-Charging-Function-Addresses header fields are not specifically any form of charging.

P-Charging-Vector is about the exchange of identifiers that are used in accounting, and therefore charging, by some other system.

P-Charging-Function-Addresses is about where to send such accounting information when you have it.

As sucht he default model in IMS, which uses these, assumes no mechanism of charging at all. I agree that a model could be built (and is indeed built and deployed) that makes it calling user pays, but that is not inherent to the IMS itself. The online charging server does make a presupposition that it is calling user only that will be charged for IMS activity. Note that in many mobile situations (particularly roaming), both users pay, so how does reverse charging work in that case?

I would suggest that to do reverse charging, you need a charging model in the first place. That does not exist in IETF. Even in 3GPP, it would need additional work, because you would need to address signalling transactions to the entities performing the charging, rather than those collecting the data.

regards

Keith

________________________________
From: sipcore-bounces@ietf.org [mailto:sipcore-bounces@ietf.org] On Behalf Of gao.yang2@zte.com.cn
Sent: Tuesday, September 21, 2010 1:57 AM
To: Paul Kyzivat
Cc: sipcore@ietf.org
Subject: Re: [sipcore] Does SIP support "Reverse Charging" function?

Hi Paul,

I am agree with you that IETF do not care about the charging at function level. But other SIP based systems, such as IMS, usually do syntax level standardization for their SIP extension.

For example, the normal charging function defined in IMS, has it's syntax level standardization in RFC3455(P-Charging-Vector header).

But by my current understanding, IMS hasn't do any syntax or function level standardization for "Reverse Charging". So, my intention here is looking for some *defined SIP syntax*  for "Reverse Charging".

Thanks,

Gao

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Paul Kyzivat <pkyzivat@cisco.com>

2010-09-20 20:35

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gao.yang2@zte.com.cn
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sipcore@ietf.org
主题
Re: [sipcore] Does SIP support "Reverse Charging" function?

Hi Gao,

SIP doesn't have any builtin mechanisms to support charging *at all*,
either forward or reverse.

Obviously there are systems that are doing charging, but that hasn't
involved the ietf. I guess IMS has some mechanisms for that, but IIUC
you are involved with IMS so probably know those better than I.

                Thanks,
                Paul

On 9/19/2010 8:55 PM, gao.yang2@zte.com.cn wrote:
>
> Hi,
>
> Background:
> 1. Reverse Charging is defined by ITU in I.256.3;
> 2. 3GPP's 22.173 and 24.173 have mentioned "Reverse Charging", but
> there's no specific definition.
>
>
> Now, we(ZTE)'d like to implement the "Reverse Charging" in SIP network.
>
> Question:
> "Reverse Charging" need some indication extension for SIP usage, I'd
> like to know how people think about this problem.
>
> If this problem has been discussed here, sorry for that.
>
> Thanks,
>
> Gao
>
> ===================================
> Zip : 210012
> Tel : 87211
> Tel2 :(+86)-025-52877211
> e_mail : gao.yang2@zte.com.cn
> ===================================
>
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