Hello guys, Does anybody knows how to remove ";npdi=yes" from INVITE. INVITE sip:XXXXXXXXXXXXX;npdi=yes@server ip:5060;dtg=SIP;user=phone I've hear that subst_uri ,can be used . Can someone give me an example Thanks Alex Fler _____ I've stopped 5,370 spam and fraud messages. You can too! Free trial of spam and fraud protection at <http://www.cloudmark.com/sigs?rc=mrcr6> www.cloudmark.com <http://www.cloudmark.com/sigs?rc=mrcr6> Cloudmark Desktop - Join the fight against spam!