[Asterisk-Users] Not register SIP and IAX

[JOAO CARLOS MOURA]

Hi all,
My Asterisk server is facing some problem that I can´t even find, any 
registrarion for that, into the error log file.
 It runs normally for while and suddenly stop registering even IAX and SIP.
Acting like that all my softphones and equipments once registered stop 
working and the only way to start  working again is applying a STOP NOW 
command. Is there anybody there has faced into this problem someday that 
could help me?

Thank´s
jmoura