[OpenSER-Users] manipulate INVITES

[Andreas Granig]

Patrick,

You don't want to alter the To header. Extract the extension from the 
R-URI and save it into an AVP (or var if >= 1.2) , then do a lookup with 
the resulting R-RUI (user-part without extension), and if it's 
successful, replace the user-part with the extension saved in the AVP/var.

Cheers,
Andreas

Patrick Miccio wrote:
> Hello everybody,
> 
> since this is my first post and I am kinda new to OpenSER, bare with
> me ;)
> 
> I have been trying to manipulate invites for the last 2 days and cant
> find the proper way to reach what is expected.
> 
> my goal:
> send invites to specific PBX (Asterisk for example) with only the
> desired extension and not the full username, this is based on a
> avp_check if that UAC needs only extensions, some do, some don't ;)
> 
> 
> Here is what I do:
> First off all I extract the real username (in subscribers) and
> extension from the R-URI and place it in "$avp(callee_user)" and
> "$avp(callee_exten)"
> 
> #############
> my solution No1 is "working"
> 
>  avp_pushto("$ru/username", "$avp(callee_user)");
>  avp_copy("$avp(callee_exten)","$avp(callee_tmp)/gd");
>  if( subst('/^To:(.*)sip:[^@]*(@[a-zA-Z0-9.]+.*)$/To:\1sip:$avp(callee_tmp)\2/ig') ){};
> 
> ->	callee_user is 012345678
> ->	callee_exten is 200
> ->	$ru is sip:012345678 at xxx.xxx.xxx.xxx;user=phone
> ->	subst [ To: <sip:012345678200 at xxx.xxx.xxx.xxx;user=phone> ]  
> 	with [To: <sip:200 at xxx.xxx.xxx.xxx;user=phone> ]
> 
> Those 3 lines work "fine", the testing Asterisk PBX gets the call
> correctly. The problem is that I should not change the "To:" part, it
> will make problems with call forwards etc...
> 
> 
> #############
> my solution No.2 NOT working.
> 
> if (subst_uri('/^sip:([0-9]+)@(.*)$/sip:$avp(callee_tmp)@\2;/i')){$};
> 
> doesn't work because OpenSER of course cant find 200 in the userloc....
> 
> #############
> 
> Generally I would think that changing the INVITE uri itself like in
> solution No.2 is the best way, couldn't find any proper way to make that
> work though.
> 
> Does anyone have an idea how to realize this properly, or even if this
> makes sense ;) ?
> 
> thx in advance,
> 
> Patrick.
> 
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