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Documentation Index

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CPS stands for Calls Per Second. While Concurrency governs how many calls are actively running, CPS governs how fast you are allowed to initiate them. It is a strict rate limit on the velocity of your outbound dialing.

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Why is CPS important?

Telephony signaling infrastructure involves intensive protocol negotiations (SIP INVITEs). To protect switching capacity, carriers throttle how quickly calls can be set up. If your application sends 100 API requests to make a call within the same second but your CPS limit is 1, then 99 of those requests will fail immediately.
  • Queueing: Well-architected campaign dialers use pacing algorithms to inject calls into the network evenly. At a CPS of 1, your dialer should wait 1,000 milliseconds between API calls.
  • Throughput: Even with a CPS of 1, you can still dial 3,600 calls per hour. Do not confuse low CPS with low volume.

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Mitigating CPS Bottlenecks

If your application cannot easily buffer or throttle outbound dialing requests locally, you will receive 429 Too Many Requests failures during usage spikes. The most permanent solution for high-throughput applications is purchasing a higher CPS allocation. Learn how to purchase a higher CPS Limit →