[Asterisk-Users] SIP Registration problem

[Isamar Maia]

Hi Folks,

I'm having problem with GS registering in Asterisk.
My setup is the following:

[1755]
type=friend
incominglimit=10
qualify=no
nat=yes
insecure=no
secret=XXXXXXXXX
dtmfmode=rfc2833
username=1755
host=dynamic
canreinvite=no
defaultip=192.168.0.1
context=sip-incoming


I have dozens of phones running the above configuration. All GS-BT101.
The problem is that some of those phones, in the other side of the world,
only register themselves during the boot and become unreachable after some
minutes not re-registering themselves periodically what would be the right
process.
Registration time is 5 min. Firmware version 1.5.0.0
Asterisk version is 7.2

Anyone has any clue?

Isamar