Hello, It is up to you. Whatever REREGISTER time you configure on your UA, SER will wait before expire. Think also about what happened if your SER will restart and lost location database. Btw in my network I have REREGISTER interval 40 sec. configured on UAs to prevent NAT router on client side to close nat transaction. (It like keep alive messages for devices that can not do it different way) I could not find UP limit for Expires in REGISTER request. _____ From: serusers-bounces(a)iptel.org [mailto:serusers-bounces@lists.iptel.org] On Behalf Of Jain, Hitesh Sent: Monday, February 14, 2005 4:25 PM To: serusers(a)lists.iptel.org Subject: [Serusers] Ser registration timeout Hi All, Is there any specific time interval between which the phones should register with the SER, before losing its registration? Thanks, Hitesh.