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Glossary

Concurrent calls

Concurrent calls are the number of phone calls a system can run at the same moment. For an AI voice agent, each concurrent call works like one phone line: with two, two conversations happen side by side, and the next call has to wait for a line to free up.

How concurrency works on a campaign

An AI agent doesn't get tired, but each live conversation still takes a line. Concurrency sets how many lines a campaign can use at once. More lines mean the list is worked through faster; fewer lines spread the same calls over a longer stretch.

Say a lender wants to remind a few thousand borrowers inside one morning window. With two lines, the agent can only be on two calls at any moment, so some borrowers may not be reached before the window closes. With more lines, the same list fits.

Concurrency works together with the other rules you set:

  • Calling windows. Calls go out only inside the IST hours you choose, so the lines have a fixed amount of time.
  • Retries. Second attempts for people who didn't answer use the same lines.
  • Per-person limits. A cap on how often one person is called applies across all agents and campaigns, however many lines you have.

Why it matters

Too little concurrency and leads wait, or reminders land after the due date. Too much and you pay for lines that sit idle. Match it to the size of your lists and the length of your calling window.

Concurrent calls in Kallix

Kallix includes two concurrent calls. Each extra concurrent call costs ₹999 a month, and enterprise plans offer higher concurrency. You choose how many parallel lines each campaign uses.

See pricing

Common questions.

More on the FAQ page, or write to us.

Start from your busiest window: how many people you need to reach, how long a typical call lasts and how many hours you have. If the list doesn't fit, add lines. Kallix includes two, and each extra one is ₹999 a month.

No. Concurrency limits how many calls run at the same moment. How many calls you make in a day also depends on call length, your calling window and how many people pick up.

Yes. A retry is another call, so it needs a free line. In Kallix it also counts toward the per-person call limit.

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