[Users] problem replacing from_uri with uac_replace_from

Dear all, we are trying to replace the from_uri with uac_replace_from function as following, but the actual from_uri is not replaced after uac_replace_from is called as debug log. so when we call load_gw() and next_gw() later in the configuration, the gateway came up is not for the replaced from_uri, it queried with original from_uri. Does anyone know how to completely replace the from_uri from original one. or a avp id that can force the replacement? uac_replace_from("$avp(s:newcallerid)","sip:$avp(s:newcallerid)@xxx.xxx.xxx.xxx:8080"); avp_print(); 0(20433) DEBUG:avpops:print_avp: p=0xf4f18568, flags=3 0(20433) DEBUG: name=<currentcallerid> 0(20433) DEBUG: val_str=<orignalcallerid> thanks Ray