Count the number of successful contexts that contain a specific code.

[vmonitor]

Here is an example context:

dir	operator	Call ID	context	B_number	code
Вход (не усп)	O	790320139	10841126052	5556133	606
Исх (не усп)	PDGI/TO-SIP-SS4-INT	790320140	10841126052	5556133	502
Исх (не усп)	el/TO-SIP-SS4-INT	790320146	10841126052	5556133	503
Вход (не усп)	O	798778645	10841126192	5221195	487
Исх (не усп)	fon-PDGI/TO-SIP-SS4-INT	798778646	10841126192	5221195	503
Исх (не усп)	PDGI/TO-SIP-SS4-INT	798778658	10841126192	5221195	503
Исх (не усп)	anet/TO-SIP-SS4-INT	798778663	10841126192	5221195	487

It is necessary to select only those contexts in which the unique B_number and the unique operator number is greater than 2. Calculate how many of these contexts contain a specific operator and are successful (ie dir =Исх (усп))

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my dimensions:

=Aggr(Count(Distinct operator)>2, context)and Aggr(Count(DistinctB_number)=1, context)

=operator

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I can't write the expression!

Tried it like this but it is not correct:

if(Aggr(Count(Distinct operator)>=3, context)and Aggr(Count(DistinctB_number)=1, context)
,count(Aggr(Count({<dir={"Вход (усп)"}>}context), context)))

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I want to have such table.

operator	all calls	successful  operator	successful  context	context&503
atel	33	11	20	0
irika	28	9	0	28
ELINE-PDGI	19	1	3	0
wer–PDGI	14	1	0	12
K-PDGI	13	1	2	1
S-PDGI	9	4	4	2
ukanet	6	2	2	0
T1	5	0	0	1
lycomm-PDGI	3	2	0	0
mpelcom	1	0	0	0