Every voice AI vendor publishes a language count. They are close to meaningless, because almost nobody distinguishes between the two things a count can mean — and the gap between them decides whether your agent works.
Supported versus production-tested
Supported usually means the underlying speech vendor lists the language. That is how claims of eighty or more languages appear on the websites of companies with a handful of engineers. It is technically true and tells you almost nothing.
Production-tested means someone has run live calls in that language, listened to what the agent misheard, and fixed it. That number is far smaller at every vendor, and it is the only one worth comparing.
Ask directly: “Is this language production-tested, or supported by your text-to-speech provider?” The hesitation is the answer. At ArtIntele the number is 20+, every one of them run on real customer calls, and any of them can be demonstrated on request.
Why Indian languages are genuinely harder
Code-switching. Indian callers do not speak one language per sentence. A perfectly ordinary Bengaluru utterance can contain two languages and an English loanword. Systems that detect language once at the start of a call fall apart on it.
Accent variance inside one language. Hindi in Mumbai, Patna and Hyderabad differ enough to change recognition accuracy materially. A benchmark averaged over a dataset says little about your callers specifically.
Names and addresses. These are the highest-value and lowest-accuracy part of most calls. An agent that captures the appointment but mangles the name has not finished the job.
Line conditions. Much of this happens on a moving two-wheeler with wind noise, not on a headset in a quiet room.
How to test a vendor properly
- Give them your own call recordings, not a script they have rehearsed.
- Ask for a call that switches language mid-conversation, because your callers will.
- Make the agent capture a name and an address, then read them back.
- Interrupt it, and listen to how it recovers.
- Ask what happens when it cannot understand — does it escalate cleanly, or guess?
The practical answer
For a business in India the languages that matter are the ones your callers actually use, which is usually three or four rather than eighty. Depth in those beats breadth across a list nobody has tested.
Pick the vendor who will demo your three, on your recordings. Treat any unwillingness to do so as a decision made for you.