FB_CALLLIST: AttrFn check for number-of-calls, extend possible values to 40 calls
FB_CALLLIST: AttrFn check for number-of-calls, extend possible values to 40 callsView Changes
Source: FB_CALLLIST: AttrFn check for number-of-calls, extend possible values to 40 calls (https://sourceforge.net/p/fhem/code/11835/)