The difference among と言えば and と言うと


I was trying to understand the difference among those two forms, but I am not
sure about it. Could somebody provide me some example and explain it to me?




According to this page:

<http://www.edewakaru.com/archives/7057482.html>

といえば and というと, in the sense of "speaking of" are essentially interchangeable
(though there are other uses of といえば), but that といえば is often used when
remembering something and you use というと when you want to ask for clarification
about something.

The example given on that page is:

> 秘書：社長、山田さんから電話がありました
>
> 社長：山田さんというとA会社の山田さんか？
>
> 秘書：はい、そうです。

Here one should not use といえば.

