[Users] AVPops question

Joachim Fabini Joachim.Fabini at tuwien.ac.at
Thu Dec 15 12:13:55 CET 2005

Hi Bogdan,

> why do you need a variable key name?

To generate and store a time- and call-id- (and maybe
tag)-dependent string at first time when a proxy sees 
a specific call-id.  And to be able to retrieve this 
string at later time (possibly from other proxies when
they process messages having this call-id).
Background: add/remove information/headers in the 
core network that must not be visible to the UA.

> wouldn't this work for you?
> avp_printf("i:10", "$hdr(call-id)-$Ts");
> avp_pushto("$Myheader","i:10"); 

Two problems that I see:
1. This stores the attribute on a per-contact base. 
   In the case of an UA having several concurrent calls
   (imho) I can track at most one call.
2. Other proxies can not access this info (as it could
   if the call-id-related stuff was written to a DBS
   with the call-id as name/key)

The main requirement is thus firstly to have database-
stored AVPs on a per-call base. And, secondly, to be able 
to retrieve the AVP values from the DBS when processing 
the content of any message belonging to this call, even 
by a component that did not generate this AVP.


> Joachim Fabini wrote:
> >Hi,
> >
> >Is there a way or workaround to generate AVPs with header 
> >values as AVP name? It seems to me that the current AVP
> >concept defines the AVPs at OpenSER startup, so
> >header-value-based names are not feasible.
> >
> >What I need is the following: Store/retrieve a (key,value) 
> >pair where the key is the current message's call-id and
> >the value some combination of header values and pseudo-
> >variables.
> >
> >e.g. use the ops
> >avp_printf("$hdr(call-id)", "$hdr(call-id)-$Ts");
> >avp_pushto("$Myheader","$hdr(call-id)"); 
> >
> >in order to append the following header to the SIP message:
> >Myheader: 23459 at 
> >
> >Any idea how to do this in OpenSER?
> >
> >thanks in advance
> >--Joachim
> >
> >
> >_______________________________________________
> >Users mailing list
> >Users at openser.org
> >http://openser.org/cgi-bin/mailman/listinfo/users
> >
> >  
> >

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