[Serusers] SER and SIP headers (IMS)

[Curro]

Hello and thands for your answer


As you can see, what I'm trying to do is studying IMS and use SER for
it. So, I wanted to start by little problems like headers. 
 
It could be helpful whether someone could give me his/her point of view
about IMS and SER. It means, what big problems they see to adapt SER to
act as IMS Proxy and, on the other hand, what things they think could be
easily done, maybe with little changes on modules?. 

It could help me to know how big could be this work, and whether it's
worth or not. I imagine that it's not a priority to Iptel's guys (or it
is?) write or adapt modules in order to adapt SER to IMS.

By the way, a question about writting new module. Based on your
experience, how many time and people could take write a new module based
on rr to add Path header and extract information from headers?

Really thank you for your answers, comments and help.

Curro

On Mon, 2004-03-08 at 18:55, Jan Janak wrote:
> I know how IMS Path header field works. If you want to do something like
> this then you will need to write a new module. A lot of code from rr
> module could be reused, the tricky part would be storing this
> information in usrloc (it is possible but requires more coding).
> 
>  Jan.
> 
> On 08-03 18:25, Curro wrote:
> > Thanks Andrei and Jan for your answers.
> > 
> > I see that it is not easy to do this with SER. I wanted to do this with
> > headers to construct a header which indicates the user agent which Route
> > it should follow. I'll try to explain it better. The idea is based on
> > IMS standard. Proxies on the way add theirselves to a Path header. When
> > the response to a request come back to the UA, it takes the Path header
> > and creates a Route header dynamic(used at SIP Proxies which act as
> > loose router).
> > 
> > What I really want is use Route header in my UA to test loose router
> > function. Do you know any other way to do this?
> > 
> > Thanks.
> > Regards, 
> > Curro
> > 
> > On Mon, 2004-03-08 at 13:23, Andrei Pelinescu-Onciul wrote:
> > > On Mar 08, 2004 at 11:51, Curro <curro_dominguez at terra.es> wrote:
> > > > 
> > > > Hello
> > > > 
> > > > I would like to ask the list some questions about headers. I've been
> > > > reading the list and textops module, but I haven't found how to do this.
> > > > 
> > > > Imagine a scenario with 2 SER proxies. The first proxy adds a header
> > > > like: 
> > > > Path: <....>
> > > > 
> > > > 1 )How can the second proxy add a parameter to this header (and not a
> > > > new header)? The result that I'm looking for is something like:
> > > > 
> > > > Path: <....>,<....>
> > > > 
> > > > 
> > > > 2 ) I know that SER can check whether a header is
> > > > present(is_present_hf()), but is it possible to extract the information
> > > > of a header and use it? I can't use search() function, because I don't
> > > > know the information, just the header name. I need to read some
> > > > parameters from a header of a SIP message to construct a new header. 
> > > > 
> > > 
> > > You could try subst() from textops (it might be documented only in the
> > > sgml in textops/doc). You have a special escape: \u which will expand to
> > > the message uri, but if you want something else than the uri, you are
> > > out of luck :-)
> > > E.g.:
> > > subst('/^(Path:.*)$/\1,uri=\u'); 
> > > will add  uri=<msg_uri> to your Path header.
> > > 
> > > Andrei
> > 
> > 
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