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по вызову stresses
gen.	on call; at call; in response to a call (clck.ru dimock)
mil.	on an on-call basis
mil., tech.	on-call
telecom.	oncall (oleg.vigodsky)
uncom.	on an as-needed basis (о работе; иногда встречается в таком значении 4uzhoj)

по вызову: 524 phrases in 56 subjects

Accounting	2
American usage, not spelling	3
Apollo-Soyuz	1
Armored vehicles	2
Artillery	4
Astronautics	3
Automobiles	1
Aviation medicine	1
British usage, not spelling	1
Business	1
Caspian	1
Cinematography	3
Communications	5
Computer networks	10
Computers	10
Construction	1
Criminal law	1
Diplomacy	2
Drilling	2
Economy	5
Electronics	17
Elevators	2
Energy industry	3
Euphemistic	5
Firefighting and fire-control systems	5
General	35
Informal	1
Information security and data protection	1
Information technology	30
International relations	1
Law	13
Makarov	15
Mass media	70
Medical	4
Microsoft	2
Military	66
Mobile and cellular communications	1
Name of organization	3
NATO	1
Notarial practice	1
Oil / petroleum	1
Oil and gas	1
Police	3
Programming	28
Quality control and standards	1
Rail transport	1
Rhetoric	2
SAP	1
Security systems	5
Slang	1
Technology	30
Telecommunications	108
Telephony	3
Trade unions	1
Travel	1
Vulgar	2