[Serusers] avp_subst for SER + some general rantings about av pairs and lingo...

Greger V. Teigre greger at teigre.com
Mon Jul 17 11:41:18 CEST 2006

Note that this is true for SER HEAD (0.10.x). 0.9.x does not have avp_subst.
In SER HEAD, a lot of new (and very powerful) avp manipulation functions 
were added.  They are created for utilizing the new selector 
(@something.part[x]) and the extension of $avp adressing of av pairs.

BTW, the lingo is quite technical, I feel...  The @ selectors are 
basically pre-defined variables that can be used to address (pretty much 
any) parts of the SIP message and manipulate them. Avpairs 
(attribute-value pairs) are basically variables (string or integer) that 
have a variable name and a variable content.  By using $variable_name 
you are referring to a variable with a value. This value can be 
collected from the SIP message, it can be manipulated and it can be put 
into the reply (or the message to forward).
The tricky part is to understand the scope of these variables (main 
route, onbranch, onreply, onfailure) and what you can actually do with a 
message in each.

Luis Silva wrote:
> Hi, avp_subst exists in ser (avp module).
> BTW, is there another better solution for doing the same? tks
>> From: "Nuno Ribeiro" <nribeiro82 at gmail.com>
>> To: "serusers at iptel.org" <serusers at iptel.org>
>> Subject: [Serusers] avp_subst for SER
>> Date: Tue, 11 Jul 2006 17:17:52 +0100
>> Hi all!!
>> I notest that openser has a function avp_subst(). Does ser has a 
>> function
>> with the same purpose?
>> I saw the function subst() in the textops but you can only substitute
>> something directly in the message,right?.
>> Regards,
>> -- 
>> Nuno Ribeiro
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