Understanding CPS and Concurrent-Call Limits

CPS (calls per second)

CPS is the rate at which new calls can be originated on a trunk. A predictive dialer places multiple simultaneous calls to compensate for no-answers and busy signals; the trunk's CPS limit caps how many NEW calls can start in any given second, independent of how many are already in progress.

Concurrent calls

This is the maximum number of calls that can be active on the trunk AT ONCE — dialing, ringing and connected combined. Exceeding it means additional call attempts are rejected until capacity frees up.

Why both matter for predictive dialing

A predictive dialer's pacing algorithm needs enough concurrent-call headroom to dial ahead of agent availability, and enough CPS to keep that pipeline full during a busy campaign start. Undersized limits show up as slow campaign ramp-up or dropped/delayed connects, not as an obvious error.

Where to find your limits

Published CPS, concurrent-call and related route specifications (ASR, ACD, PDD) are shown on the VoIP overview page per route type, and are confirmed for your specific deployment during route-test review.