The 'Default DPNSS Password is configured in the PBXXX using AMO LWPAR. The default value for this parameter is = 9999 , which is the value usually configured in Realitis DX systems. To change the value of this parameter use the following ( for example to set the default = 1234) :

CHA-LWPAR:TYPE=CDG, BLNO=<number>, CDGTYPE=CONF, 
DEFPASSW=1234