[OpenSER-Users] manipulate INVITES

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 -> $ru is sip:012345678@xxx.xxx.xxx.xxx;user=phone -> subst [ To: <sip:012345678200@xxx.xxx.xxx.xxx;user=phone> ] with [To: <sip:200@xxx.xxx.xxx.xxx;user=phone> ] Those 3 lines work "fine", the testing Asterisk PBX gets the call correctly. The problem is that I should not change the "To:" part, it will make problems with call forwards etc... ############# my solution No.2 NOT working. if (subst_uri('/^sip:([0-9]+)@(.*)$/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.