Voice bot reply speed (latency): where the pause comes from and how to measure it
Sado AI team · · 4 min read
In short
Reply speed, or latency, is the time from the moment the caller stops talking to the voice operator’s first word. The pause builds up in five places: waiting for the end of the phrase, speech recognition, thinking up the answer, creating the voice and the phone line. If the pause is long, the caller says “hello?”; if the reply comes too fast, the operator cuts the caller off. Measure speed from the call recording and compare simple questions separately from harder ones.
What latency is and why it matters
On the phone, people answer each other with almost no pause. After two or three seconds of silence, a caller thinks the line dropped, asks “hello, can you hear me?” or repeats the question. Then the two voices overlap: the operator starts answering while the caller is talking too.
There are two kinds of speed: answering the call (from the ring to “Assalomu alaykum”) and answering each phrase (from the caller’s question to the operator’s reply). The second decides whether the conversation feels natural.
Where the pause builds up
| Stage | What happens | What slows it |
|---|---|---|
| 1. Waiting for the end | The system makes sure the caller has finished | Waiting too long |
| 2. Speech recognition | The voice becomes text | Noise, long phrases |
| 3. Thinking | The language model writes the reply, looking up a price or free slot if needed | Long instructions, fetching data from another system |
| 4. Creating the voice | The reply text becomes speech | Writing the whole reply before reading any of it |
| 5. Phone line | The sound reaches the caller | Distant servers, a poor connection |
Good systems don’t make the stages wait for each other: as soon as the first sentence of the reply is ready, the voice starts saying it.
Is a faster reply always better?
No. When a caller dictates a number in groups, “ninety-one… five hundred twelve…”, there are pauses. An operator that speaks in every pause cuts the caller off. A good operator reads the situation: it replies quickly after a question and listens to the end of a number or address. A few things matter as much as speed:
- Short replies: one or two sentences are ready sooner and heard sooner.
- Long information in parts: the main point first, then “shall I tell you more?”.
- If looking up a price or slot takes a moment, don’t go silent: “one second, let me check” helps.
- When the caller starts talking, the operator should stop at once.
How to measure reply speed
- Make 10 test calls: five with simple questions (hours, address), five with harder ones (work out a price, ask for a free slot).
- Open the recording and mark two points for each question: when you stopped talking and when the operator said its first word.
- Write down the gap. For example: 1.2 seconds, 0.9 seconds, 2.4 seconds. These numbers are only an example.
- Compare simple and harder questions separately: where a lookup is needed, the pause is usually longer.
- Make one call from a noisy place or somewhere with a weak signal.
- Replay the longest pauses: did the caller say “hello?”, did the voices overlap?
Speed in Sado
Sado answers every call at once, in about a second: no queue, more than ten conversations at the same time. If you dictate a number in groups, it doesn’t cut in; if the caller starts talking, it stops and listens. Its replies are short: one or two sentences and a question.
Recordings and transcripts of your operator’s calls are kept in the portal, so measuring this way is easy. More: AI operator for incoming calls and Uzbek voice operator. Feel it yourself: call 78 778 01 23 and ask one simple and one harder question.
Questions
What pause is normal?
Judge by how the caller feels, not by a number: a reply to a simple question should come as fast as a live operator’s. If the caller says “hello?” or repeats the question in the recording, the pause is too long.
If the caller’s internet is slow, is the reply slower too?
The caller makes an ordinary phone call, so their internet doesn’t matter. A poor phone connection can delay the sound.
Is the speed the same in the browser and on a phone call?
Not necessarily: in the browser the sound goes over the internet, on a call over the phone line. Before deciding, call from an ordinary phone too and compare.
Do short replies affect the price?
Short, clear replies make the call itself shorter. Sado charges only for talked minutes: 800 so‘m a minute, no monthly fee. Other questions: FAQ.