Symmetrical voice refers to a way that we can talk to someone on the phone in which both people can hear each other at the same time. It's kind of like being in a conversation with someone in person where you both can talk and listen at the same time. This is different from the old phone systems where only one person could talk at a time and the other person had to wait until the first person was finished before they could speak.
With symmetrical voice, it's like having a two-way street where information can flow in both directions at the same time. This can be really helpful for things like conference calls or video chats because people can talk and respond to each other in real time without any delays or interruptions. It's like having a natural, seamless conversation just like you would in person.
Overall, symmetrical voice is a way to communicate that makes it feel like you're having a conversation with someone in real life, where both people can talk and listen at the same time.