asterisk users - Oct 2004 - SetVar() with manager

Hi,

I'am intergrating Asterisk with our CRM system. I have tryed this but 
thats not working:

fwrite($socket, "Context: local\r\n");
fwrite($socket, "Setvar: Var\r\n");
fwrite($socket, "Var: ". $channel ."\r\n");

Regards,

Paul