Reference

Limits

Defaults apply to every account unless raised. The ones that matter operationally are at the top. If you’re planning a launch, share your expected peak concurrent calls with support ahead of time — raising a limit is routine; discovering it mid-campaign is not.

Calls

LimitDefaultAt the ceiling
Concurrent calls per account (inbound + outbound + browser)10outbound calls queue (HTTP 202); inbound calls beyond capacity are refused
Queue depth100new outbound calls refused with queue_full
Call placements per minute60refused with rate_limit_exceeded
Minimum balance to start a call$1.00refused with insufficient_balance; inbound answered busy
Maximum single-call telephony charge$500the charge is rejected for review rather than billed — an anti-fraud backstop
Per-flow maximum call lengthoff by default; 30 s – 4 h when setagent says goodbye and hangs up

The account’s current values are visible in the dashboard’s account settings.

Queue behaviour

When every concurrent slot is busy, outbound calls wait in a priority queue and are placed as slots free up.

FactorEffect on order
Direct calls (API, dashboard, callbacks)always ahead of scheduled and campaign work
Scheduled callsahead of campaign calls — the user chose the time
Campaign callslowest priority; they’re designed to wait
Warm leads (e.g. a fresh Meta lead)a modest boost within their class
Waiting timeevery minute in the queue improves priority, up to a cap at 15 minutes — nothing starves

Queue entries expire — a direct call after 60 s, a scheduled call after 10 min, a campaign call after 24 h (or the campaign’s end time) — so a call is never placed long after it made sense.

Requests

LimitValue
API keys per account25
Contacts per add-to-campaign request1,000 (use the filter-based bulk add for more)
DNC numbers per bulk import10,000
DNC numbers per check100
Contact secondary phones10
Contact tags50
Contact notes5,000 characters
Flow function timeout100 ms – 30 s (35 s hard cap at dispatch)
Flow function request / response body1 MB each
Prompt template / idle end message / duration-cap message1,000 characters
Real-time WebSocket connections per account20
Subscriptions per WebSocket connection50
Assistant prompts10 per minute
Data exportsone at a time; 24 h between completed exports

Campaigns and schedules

LimitValue
Campaign concurrency1 – 50, default 5 (also bounded by the account’s concurrent-call limit)
Campaign attempts per contact3
Schedule retries per run0 – 10, default 2; delay 1 – 1,440 min, default 30
Schedule monthly day-of-month1 – 28

Numbers and billing

LimitValue
Top-up$10 – $10,000 per payment
Auto-recharge threshold / amount$1 – $1,000 / $5 – $1,000; at most 5 attempts per day
Rental grace period before suspension7 days
Recording storage grace period on empty balance30 days

Next

Idempotency and rate limits

How to design an integration that stays under these.

How a call works

Where admission and queueing sit in a call’s life.