fix parent + url (4)

src/sipcentric/__init__.py

@@ -238,7 +238,7 @@ class Customer(APIObject):
             yield PhoneNumber(self._api, data=c)
 
     def calls(self, params=None):
-        for c in self._api.getMany(Call.makeUrl(parent=self, params=params, pageSize=100):
+        for c in self._api.getMany(Call.makeUrl(parent=self, params=params, pageSize=100)):
             yield Call(self._api, data=c)
 
     def callbundles(self):