[Users] AVPops question

Joachim Fabini Joachim.Fabini at tuwien.ac.at
Thu Dec 22 16:51:34 CET 2005


Hi,

Meanwhile I tried several approaches on this topic
but none of them were successful. 

To restate and clarify the problem: We must store 
values in the DBS for any call that passes through
the proxy. There can be several concurrent calls 
for the same contact (e.g. Register, Subscribe, Invite,
etc. ). So the information that must be stored 
in (and/or retrieved from) the DBS is NOT contact- 
but call-dependent. I.e. the AVP _name_ must contain 
the call-id in some way.

AVPOPS do currently not support a variable name 
field. (i.e., in the simplest case, an attribute name 
that depends, e.g., on the current call id value). 
OpenSER complains at startup about the variable 
header name. But: I see this as the only way how to 
store call-dependent info in OpenSER.

This feature is required for avp_db_store() and for 
avp_db_load(), i.e.
avp_db_store("$hdr(call-id)", "s:my_tmp_icid"); and
avp_db_load("$hdr(call-id)", "s:my_tmp_icid");

The solution of using the acc-module does not work.
Our task is to manipulate (add/remove) some sip message 
headers, not to just create DB entries.

Does anyone have another idea for a work-around? Does 
anyone else need this feature?
Unfortunately it seems to me that this change in the
AVP module requires significant implementation effort.
Maybe someone of the implementors can comment on this.

For my part, I consider having call-dependent AVP names
as a huge improvement over the current AVP implementation -
it's a change in paradigm and gives AVP users much 
more fine-grained control than they have currently.

Many thanks in advance for your help,
best regards
--Joachim





> -----Original Message-----
> From: users-bounces at openser.org 
> [mailto:users-bounces at openser.org] On Behalf Of Bogdan-Andrei Iancu
> Sent: Donnerstag, 15. Dezember 2005 11:51
> To: Joachim Fabini
> Cc: users at openser.org
> Subject: Re: [Users] AVPops question
> 
> Hi Joachim,
> 
> why do you need a variable key name?
> wouldn't this work for you?
>    
> 
> avp_printf("i:10", "$hdr(call-id)-$Ts");
> avp_pushto("$Myheader","i:10"); 
> 
> 
> regards,
> bogdan
> 
> Joachim Fabini wrote:
> 
> >Hi,
> >
> >Is there a way or workaround to generate AVPs with header 
> >values as AVP name? It seems to me that the current AVP
> >concept defines the AVPs at OpenSER startup, so
> >header-value-based names are not feasible.
> >
> >What I need is the following: Store/retrieve a (key,value) 
> >pair where the key is the current message's call-id and
> >the value some combination of header values and pseudo-
> >variables.
> >
> >e.g. use the ops
> >avp_printf("$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 10.0.0.1-4235627623 
> >
> >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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> http://openser.org/cgi-bin/mailman/listinfo/users
> 





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