Oracle's SP OUT param

Hello.
Im trying to get Oracle SPs working in django.

Procedure recives in_param and out_param

in get_data function i do

[code]
def get_data(self, in_param):
    cursor = connection.cursor()
    #out_param =
    ret=cursor.callproc("TEST_PKG", (in_param,out_param))
    cursor.close()
[/code]

the question is - how do i register out_param?
If i try to make
[code]
out_param = models.CharField(max_length=20)
[/code]
im gettig wrong type error from database.

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