[Serusers] Ser+Nat +Polycom phones

Hello, I try to configure Ser and polycom phones behind nat. phone 1 ------- | ser | ----- internet phone 2 ------- Ser listen on private network and internet. Polycom phones send public ip of Ser in SIP header. According to sip_call file (ethereal) ser know that phones are behind nat (lines 2,3,6,8) however when phone1 invite phone2 "404 Not found" message it sent by Ser . If Ser Know that phones are behind nat How can I fix that problem in ser.cfg . Thanks for your help. Harry _____________________________________________________________________________ Découvrez le nouveau Yahoo! Mail : 1 Go d'espace de stockage pour vos mails, photos et vidéos ! Créez votre Yahoo! Mail sur http://fr.mail.yahoo.com