> I think in this case they won't be strings since I read the numbers from 
a XML and they don't have the '+' character

So what? You should future proof the app. Some day there might be 
extensions in India or something.

> Not all the supervisors.I want to get the extensions of a particular 
supervisor

Do you mean the extensions of the persons he supervises? If so:

the_supervised = db(db.auth_user.Supervisor == 
ParticularSupervisor.id)._select(db.auth_user.id)
extensions_of_the_supervised = 
db(db.Extension.Person.belongs(the_supervised)).select()

This will give you the extensions of everyone that is supervised by this 
person.  


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