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The difference between Receiver and Speaker
The speaker is called the speaker receiver. The main difference is that the speaker works only when it's a bell or a hands-free, because the speaker is often more powerful than the receiver (and not sure). And the receiver is just working on the call!
I'll mention it from an electrical point of view
Phone hands-free generally in receiver receiver (receiver), from the receiver impedance general 32 ohms (in one single noise (two lines) both generally are 8 ohms), generally around dozens mw power (such as power rating in 30 mw).
The bell sounds in the speaker speaker, the impedance is generally 8 ohms, and the power is around several hundred mw (for example, the rated power is 0.5 W).
The speaker is answered by a certain distance, and the receiver is directly answered by the receiver
The scope of work of the speaker is wide, involving music category; The scope of the receiver is human voice
The power of the speaker is relatively large, and the power of the receiver is relatively small
The geometry of the speaker is larger and the geometry of the receiver can be smaller
The position of the speaker is arbitrary and the receiver can only be in one location
Many of the speakers will have to add external amp; reseiver will be able to use the film, and reseiver will play back its own voice, so it will solve the problem of sidetone/echo by algorithm.