[Serusers] Feature Request: Log Contact hf of 3xx Response in Accounting

[Daniel-Constantin Mierla]

On 04/21/05 18:03, Martin Koenig wrote:

> Hello,
>
> I think it would make sense to log the Contact header field of a 3xx 
> Response in Ser accounting in order to be able to bill a 
> Call-Forwarding user.
>
> What do you think?

There were several discussions on this mailing list about the same 
topic. The general opinion is that this is a wrong approach. When 3xx 
comes back to caller it should accept or reject the redirection, so it 
should be charged for the call, not the callee.

One problem is that the new call will have different dialog 
characteristics (callid, tags ...) and you do not know if the call is 
really due to 3xx or because the caller had dialed by itself. There are 
phones that do not handle redirection at all and the caller may have the 
PSTN number of callee as well which may be the same number from 3xx contact.

Another problem is that SIP phones/clients usually do not ask to follow 
or drop a redirection, so a better approach would be to drop 3xx replies 
on server and implement call forwarding on server where you can log more 
details about the call and you are sure that callee must pay.

Daniel

>
> With best regards,
> Martin Koenig
>
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