Can you talk on the iphone and use this as the speaker?

I would like to use this or a similar device as a speaker such as a conference phone. In other words plug my Iphone into this while on my desk, then when I receive a call just leave it plugged in and answer the call using the speaker system in the DC291.

Philips DC291 Docking Clock Radio with Remote

Philips DC291 Docking Clock Radio with Remote

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