The application consists of two parts: a voice translator and a speech synthesizer.
The voice translator works in conversation mode without using the Internet.
The speech synthesizer directs speech into the conversation during an active telephone conversation.
Both parts can work both independently from each other and together. To work together, you need two iOS devices, on one of which a translator works, and on the other a speech synthesizer. When a call arrives at the device where the synthesizer works, the joint work of the two parts allows simultaneous translation of the telephone conversation.