[Serusers] Contact Address on ser

Hi all I want to use a contact adress configure in serweb to map an public sip address on a private sip address on my local sip network : for exemple : local sip address is : sip:mobi2@"local domain name" public sip is address : sip:jcfesantieu@iptel.org i have configure the contact on serweb : serctl fifo ul_show_contact location mobi2 <sip:jcfesantieu@iptel.org>;q=1.00;expires=969 <sip:mobi2@172.21.30.3:5061>;q=0.00;expires=1415 mobi1 and mobi2 are REGISTER on my ser router . when i want to call mobi2 from mobi1 , it's works . But when i want to call jcfesantieu(a)iptel.org ; the " user not found " error message appear . I have made many tests in the file configuration ser.cfg but it's still don't work. What kind of configuration should i use in ser.cfg to use contact ?