At the risk of being flamed by the developers that argue messing with SIP headers can break interoperability, cause parse problems, is a bad programming practice, etc, etc. I'm posting a little example of using an AVP to set the callerid of a user. Disclaimer: I'm not suggesting this is what anyone should or should not do, I'm just showing an interesting example. In the usr_preferences table, there is the following row: Username: user1 Attribute: callerid Value: "My Name" <sip:19995551212@example.com Note that the ending > after .com in the value column is missing on purpose. I haven't spent the time tweaking the regular expression below to enable the trailing > to be included. #------------------------------------------------------------------------------------------- # Set the callerid for the user from an AVP #------------------------------------------------------------------------------------------- if (avp_db_load("$from/username", "s:callerid")) { subst('/^From: (.*)>(.*)$/From: $avp(callerid)>\2/ig'); }; Some things to consider would be to use one subst to change the "name" and another subst to change the "number". Obviously, two AVPs would be needed to implement this. Regards, Norman Brandinger norm at goes dot com