Business phone numbers that answer themselves
Rent a number in the console, or bring one you already own from Twilio, Plivo or Vonage over SIP. Either way, an AI voice agent picks up and places calls on it.
Area codes
What each code covers, when it went into service, and how to put an agent on one.
Two ways to get a number
Both end the same way: a number bound to an agent, taking and placing calls.
Import over SIP
Keep your existing carrier, your rates and your porting history. Point your trunk at Smallest AI and bind the number to an agent with one API call.
Buy in the console
Pick a country and provider, choose from available numbers, and rent it from $10 a month. The number is ready to attach to an agent as soon as it is provisioned.
What runs on the call
Speech recognition, speech synthesis and orchestration are all built here rather than assembled from third-party APIs, which is why the latency and audio-format numbers below are ours to quote.
Component
Figure
Source
Speech synthesis
$0.175 per 10K characters
Published API pricing
Speech recognition
$0.003/min pre-recorded, $0.004/min realtime
Published API pricing
Pulse Pro accuracy, English
~5.4% average WER, tied 2nd
Public Open ASR Leaderboard
Telephony formats
µ-law, A-law, PCM, MP3, WAV
No transcode step
Audio quality
44.1 kHz
Published
Lightning TTS latency
~200 ms time to first byte
Published, docs.smallest.ai
Language switching mid-sentence
A caller can open in English and continue in Hindi inside the same sentence without the agent losing the thread. Alongside English and Spanish, voices cover Hindi, Tamil, Telugu, Bengali, Marathi, Gujarati, Kannada, Malayalam, Punjabi and Odia, with automatic language detection on the recognition side.
अक्सर पूछे जाने वाले
प्रश्न
How do I get a virtual phone number?
Can I keep my existing business number?
What is the difference between a local and a toll-free number?
Can I use a number for both inbound and outbound calls?
Do I need a number in every area code I call?
What does a phone number cost?