Marcello - thanks for attention to our OOB.
I will give to you links on information sources in which it is in detail told about typical arms of planes on each model. Unfortunately links only in Russian, but you can take advantage of the translator.
Usually about typical arms of these planes it is written in the end of the text.
And the full list of every possible arms is after specifications in the end of page.
Here link on a site of the translator:
http://www.online-translator.com/default.asp? lang=en
In it you can translate even sites entirely with preservation of formatting of the text.
If you have difficulties or you do not have time for employment by translate. I can make in detail to you normal translate of typical arms of these planes.
Su-17
http://www.airwar.ru/enc/fighter/su17.html
http://www.airwar.ru/enc/fighter/su17_1.html
http://www.airwar.ru/enc/fighter/su17m.html
http://www.airwar.ru/enc/fighter/su17m2.html
http://www.airwar.ru/enc/fighter/su17m3.html
Su-20 export
http://www.airwar.ru/enc/fighter/su20.html
Su-22 export
http://www.airwar.ru/enc/fighter/su22.html
Mig-23BN
http://www.airwar.ru/enc/fighter/mig23bn.html
On these pages all is written. From the moment of creation of the plane till the moment of its recycling. It is described as in what year it is made, by whom it is made, what arms, what equipment were established, etc.
If you have problems with translate - write here about it and I will work over text translation on arms of these planes.
Why you were interested by these planes?