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  • Call listing defaults to limit=50 and offset=0; call-list limit is between 1 and 200, and offset cannot be negative.
  • For requests handled by idempotency middleware, Idempotency-Key is at most 255 characters, and captured request bodies are limited to 1 MiB.
  • Audit event listing defaults to 50 results with a maximum of 100.
  • Retention policies accept 1–3650 days, constrained by the organization’s plan allowance.
  • SIP trunks expose configurable max_cps and max_concurrent_calls admission settings.
  • Subscription entitlements and usage allowances may constrain new Voice Agent sessions and organization resources.
Do not infer a universal call-concurrency allowance, AI latency guarantee, or provider rate limit from these API constraints. Your plan, provider, and deployment may impose further limits.