[cisco-voip] getting state from isdn line (idle-occupied)

[Konne]

hi,

ive running a Router 2811 ccme4.1 with cisco voip phones 7961G, 
connected to a Siemens HiPath 3550 with ISDN Phones. Is it possible to 
Get the state of a line from the siemens. i mean, if the ISDN Number 700 
is occupied/idle i will see it on my Cisco 7961G phone as occupied/idle 
(led red/green/orange)

or is it impossible.

thx