The limitaiton of voicebot nowadays
The core of voicebot is chatbot. Chatbot is running on instant messengers like Facebook Messengers, Wechat, Line, Telegram and even on WhatsApp. To know more about whatsapp chatbot, read this article XXXXX. So is it simply converting a text bot with voice elements, then you will get a voicebot ? Technically yes, but there are much more needed to be considered.
Your Chabot has to be A.I. based with Natural Language Processing unit, equipped with Automatic speech recognition ASR and Text to speech TTS engine. The environment of chatbot and voicebot is very different, if you just simply turn your text bot into voice without redesigning your product, is definitely a failure when it is used.
There are no visual elements like menu button, list, quick reply or carousels like the CUI provided by text chatbot. Instead, voicebot is simply a voice user interface (VUI), voicebot cannot answer everything you ask, and infact, it should not be. Producers have to carefully consider how users could understand what particular services voicebot can serve.