[asterisk-users] cisco 7961 , asterisk and busy lamp

[Max Bergmann]

How can i programming a Cisco 7961 to be used as busy lamp field?

my configs :

sccp.conf :

[devices]
type        = 7961
tzoffset    = 0
autologin   = 601
speeddial   = *31, Hanna  --> other SIP telefon

extensions.conf :

exten => *31,hint,SIP/hanna
exten => *34,hint,SCCP/601


on SIP Telefon ( SNOM 360 ) everything functions good and i have busy 
lamp when cisco telefon Offhook, but differently does not function
any idea ?

Any input is greatly appreciated.