AI voice agents on a 646 New York number
Bring a 646 number you already own from Twilio, Plivo or Vonage, and connect it to an agent over SIP.
Manhattan, where every 646 number rings.
What a 646 number actually is
The 646 area code serves Manhattan in New York City. It went into service in 1999 as an overlay on 212, meaning both codes cover the same ground. 646 exists because Manhattan ran out of 212 numbers, not because it covers a different neighbourhood.
A call from a 646 number is most likely a mobile phone or a business line in Manhattan. Four codes now serve the same area: 212, 646, 332 and 917.
Connecting an agent to your 646 number
Three steps in the console. Pick a step to see the screen you'll be working in.
01
Import over SIP
Point your Twilio, Plivo or Vonage trunk at Smallest AI, or rent a US number in the console.
02
Bind it to agent
Assign the number, pick a voice, write the prompt, and switch on inbound calls.
03
Take and place calls
Inbound answering plus outbound calls over telephony, webcall or chat.
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.
~200 ms
Lightning TTS latency
Time to first byte, published at docs.smallest.ai.
~5.4%
Average WER, English
Pulse Pro, tied 2nd on the public Open ASR Leaderboard.
44.1 kHz
Telephony-ready audio
µ-law, A-law, PCM, MP3 and WAV, with no transcode step.
16
Languages, switchable mid-sentence
A caller can open in English and continue in Hindi without the agent losing the thread.
Other codes covering New York City
All four overlay the same geography. Any of them reads as a local Manhattan number to the person receiving the call.
Frequently
asked questions
Is 646 a real area code?
Is a call from a 646 number a scam?
Can I use a 646 number if I'm not in New York?
Which carriers can I import a 646 number from?
What's the difference between 646 and 212?
Should I use a 646 number or toll-free?