Manipulate Uri-User Diversion Header

Hi

I am trying to manipulate the user in the Diversion header to add the country code if it does not have one, but I doesnt work Any ideas?

sip-manipulation

    name                                    Changediver


    description


    split-headers


    join-headers


    header-rule


            name                                    store_Diversion_HR


            header-name                             Diversion


            action                                  store


            comparison-type                         case-sensitive


            msg-type                                request


            methods                                 INVITE


            match-value


            new-value


            element-rule


                    name                                    store_Diversion_ER


                    parameter-name


                    type                                    uri-user-only


                    action                                  store


                    match-val-type                          any


                    comparison-type                         pattern-rule


                    match-value                             ^([6-9])([\d]{8}$)


                    new-value


    header-rule


            name                                    add_div_HR


            header-name                             Diversion


            action                                  add


            comparison-type                         boolean


            msg-type                                request


            methods                                 INVITE


            match-value                             $store_Diversion_HR.$store_Diversion_ER


            new-value                               "34"+$store_Diversion_HR.$store_Diversion_ER