My router doesn't have option 66 available. How can I auto provision the phones with it?

You can add the auto provisioning URL directly into the handsets. http://p.sipvoice.com.au

1. Determine the IP address of the handset by pressing the OK button ONCE. Note this IPv4 address (example 192.168.0.30)
   
2. Open a web browser and enter this IP Address into the address bar
   

1. Login to the handset (there could be two different log in to check :
         Username : admin
         Password : admin
   or
         Username : admin
         Password : flex
2. Click on Settings --> Auto provision
   
3. Change the Server URL - http://p.sipvoice.com.au/
   
4. Click Autoprovision Now at the bottom of the page.