Line in use LEDS

Im using a Grandstream GXP-2000 and an Aastra 480i. I figured I could just create 3 extensions, ie 101,102,103 for each line and both phones could register those 3 extensions simultaniously, making the extension busy when in use, a person could hit hold and pickup from a different phone, etc. Anyone know how to do this.

Using Asterisk @home

Here is a whole thread about it … ine+status