If you are listening to audio played by your docked iPhone on your iDock radio and you receive a call, you will notice the audio playback mutes, and you will hear your iPhone ring.

If you are not in iPod mode (for example DAB mode) and you receive a call, the iDock audio will not be muted and the iPhone will still ring.

To answer any call received while your iPhone is docked, you should remove the iPhone to answer the call, the phone microphone may be obscured if you try to take the call using the speaker phone.