Most SIP phones support some sort of Action URL. If your phone has these but is not listed you can use the generic URL below. This features all the same support as the others documented here. You will need to determine if your phone has any special action variables and add them as needed.
Example
http://192.168.1.1:9090/ipcfg/config?ext=3105&ip=192.168.12.150&mac=58:ab:36:ef:23:de