Ability to set ringing volume and on / off growing calls in silent mode

Code:
;W580 SW-R8BE001 
;Ability to set ringing volume and on / off growing calls in silent mode 
;(!) When you adjust the volume, the growing call is not disconnected 
;v.2 
;(c) E1kolyan 
;(p) HierOS 
452D6E6C: C943 C143 
452D6DAA: C943 C143 
452D7200: C943 C143