Hi, Meanwhile I tried several approaches on this topic but none of them were successful. To restate and clarify the problem: We must store values in the DBS for any call that passes through the proxy. There can be several concurrent calls for the same contact (e.g. Register, Subscribe, Invite, etc. ). So the information that must be stored in (and/or retrieved from) the DBS is NOT contact- but call-dependent. I.e. the AVP _name_ must contain the call-id in some way. AVPOPS do currently not support a variable name field. (i.e., in the simplest case, an attribute name that depends, e.g., on the current call id value). OpenSER complains at startup about the variable header name. But: I see this as the only way how to store call-dependent info in OpenSER. This feature is required for avp_db_store() and for avp_db_load(), i.e. avp_db_store("$hdr(call-id)", "s:my_tmp_icid"); and avp_db_load("$hdr(call-id)", "s:my_tmp_icid"); The solution of using the acc-module does not work. Our task is to manipulate (add/remove) some sip message headers, not to just create DB entries. Does anyone have another idea for a work-around? Does anyone else need this feature? Unfortunately it seems to me that this change in the AVP module requires significant implementation effort. Maybe someone of the implementors can comment on this. For my part, I consider having call-dependent AVP names as a huge improvement over the current AVP implementation - it's a change in paradigm and gives AVP users much more fine-grained control than they have currently. Many thanks in advance for your help, best regards --Joachim