Asterisk SIP notify Linksys 922


i got a probleme with the command : sip notify [CONTEXT_NOTIFY] [NUMBER] and the IP Phone linksys. When i put command in asterisk, a SIP notify message is send to Phone but the phone answer UNAUTHORISED. How can i do to reboot phone so?

my command is sip notify linksys 10000

my sip_notify.conf :

[linksys] Event=>restart Content-Length=>0