Bogdan, I have no problem changing to To: but the INVITE doesn't match evn though I use the same code. I tried subst and subst_uri - here is the code: if (subst("/^INVITE(.*)$/INVITE sip:18888888888@xxx.xxx.xxx.xxx;/") ) { log("URISUBSTITUTED"); } else { log("INVITE NOTSUBSTITUTED"); } if (subst("/^To(.*)$/To: sip:18888888888@xxx.xxx.xxx.xxx;/") ) { log("TO SUBSTITUTED"); } else { log("TO NOT SUBSTITUTED"); } Thanks, Gene -----Original Message----- From: Bogdan-Andrei Iancu [mailto:bogdan@voice-system.ro] Sent: Friday, June 02, 2006 12:39 PM To: Gene Cohen Cc: users(a)openser.org Subject: Re: [Users] SIP Invite Header Modification Hi Gene, As I see, you actually want to change the first line of INVITE and not the headers..for changing the ruri you have the subst_uri() function (regexp based) in textops module: http://openser.org/docs/modules/1.0.x/textops.html#AEN141 make a regexp to get rid of the ruri params. regards, bogdan Gene Cohen wrote: