thx miconda for you reply but as am still new to these stuff could you explain more and how to do this check ? here is my configuration file : http://pastebin.com/m793cbd72

btw thanks inaki for your explanation but to make things much clear putting my configuration file doesn't mean to have a spoon-feed solution , i mentioned that am still new and before poting my question i searched alot and read much more about avp module either on kamailio site or voice-system tutorial but as am still in my first steps got some diffculty to understand these issues and finally i put my question for all people not for particular person and who could help me i'd appreciate that

i'm trying to understand the steps inaki as much as i can here is what i got : what i understood to make such blind call forward feature in firstly i should use the function avp_db_load and load in the string AVP callfwd the value of the attribute callfwd which matched the requested user (i already know that $ru mean the sip request uri ) now after loading the value i should push it to the new R-uri which has the "value field " in the usr_preferences column using avp_pushto("$ru","$avp(s:callfwd)") so i want to ask now what is the equivalent pseudo-variable to the new R-uri ? i want to make somthing like that if(avp_check("$avp(s:callfwd)", "eq/$ru/i")) avp_delete("$avp(s:callfwd)"); btw i dont know what /i mean in the op_name but i saw some examples put it i tried with that sytanx but it didn;t work , as what i understood also that the attribute value is being loaded in ram so what i want to achieve is to check if the attribute callfwd are found in ram so delete it ,else establish the call in normal way i hope my words are clear and Understandable regards