Connect Voice Switched Speakerphone IC to CODEC problem

I want to make a VoIP speakerphone but now I found echo problem (sound from speaker loop back to the microphone). I use a normal audio CODEC so it does not have echo cancellation feature. So now I want to find an IC which I can add in the analog path (e.g between the microphone/speaker and CODEC) to solve the problem. I found some IC called Voice Switched Speakerphone IC which is designed for normal telephone. Basically it changes the full-duplex conversation to half-duplex.

One of these IC : **broken link removed**

I want to ask if I can connect the transmit in/out pin of this kind of IC to the microphone/speaker pin of the CODEC? (in the other words, I want to feed the signal out from the voice switched IC to the CODEC).

As I do not want to change the CODEC which I am using, apart from the voice switched IC I mentioned, is there any other method I can employ?

Thank you