Rate Limits

Rate limits for the Voice API are set by account by your customer account manager. By default, rate limits are set to 3 CPS and 30 active sessions. If you think you may need additional voice capacity, please open a ticket with our Account Management team.

If a rate limit is hit when creating an outbound call the API will return a HTTP-429 informing the reason with the message Account call creation rate limit exceeded or Account concurrent call limit exceeded. If a rate limit is hit during a <Forward>, the call will be allowed, but will still count against the limit, so subsequent calls may be rate limited. If a rate limit is hit during a <Transfer>, the error will be sent to transferCompleteUrl also informing the reason in the errorMessage field. There are no notifications when inbound calls are rejected due to rate limits.

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