This object when set to 'true' enables the trigger for SGSN
change for postpaid users using this charging profile. The
SGSN address is added to the SGSN list in the context G-CDR.
When the SGSN limit is reached, the G-CDR is closed. Current
SGSN address is written into the CDR, when the cgprsCgRelease
value is 'release4' or above, and service record is
generated.