[asterisk-users] NAT issue (i think?)

[Ron]

Hi All.

got this problem that IP phones could not re-register to my server. even 
if device is power cycled it still would not register. the solution i 
found was to change the SIP port settings on the phone and it will 
register. but after registration expires and its time to re-register the 
same thing will happen, so i have to update the port settings again just 
to make it work which is troublesome.

i'm using Asterisk 1.4.31 with the following realtime config:

rtcachefriends=yes
rtsavesysname=yes
rtupdate=yes
rtautoclear=no

one thing i noticed is that it only seems to happen on linksys devices 
e.g. PAP2 and SPA's. another phone i'm using is yealink and so far no 
client has complain about it.

hope anyone can help. thank you.

regards
Ron