Overview

Twilio imposes some rate restrictions on certain calls and message products. This guide explains the limitations.

 

What You Need To Know

Voice calls 🔗

The default outbound call rate is 1 call per second (CPS), but there are other factors that may affect calls using Twilio's Programmable Voice, Client, and Elastic SIP Trunking products.

For full details, see How fast can I place or receive phone calls with Twilio.

SMS text messaging 🔗

The default outbound SMS message rate is 1 message segment per second (MPS) on SMS-capable long codes in the US and Canada, but this rate varies for different phone number types and originating countries.

For full details, see Understanding Twilio rate limits and message queues.

MMS multimedia messaging 🔗

The default outbound MMS message rate is 1 MMS message per second (MPS) on SMS-capable long codes in the US and Canada, but there is also an Account SID rate limit.

For full details, see Twilio multimedia messaging (MMS) account rate limits.

Account-Level Daily Messaging Caps  🔗 

To prevent fraud and align with carrier expectations, Twilio applies a daily messaging cap of 20,000 messages per day on net new account upgrades that do not have an approved Business Primary Customer Profile (PCP). Similar to the voice concurrency limits placed on non-business users, this measure helps protect the platform while having minimal impact on legitimate users. To lift this limitation and send higher daily volumes, users must register as a business by securing an approved Business PCP.

Throughput increases 🔗

Outbound voice call and short code SMS throughput increases are available for a monthly fee. For pricing inquiries, please reach out to your Account Manager, or contact Sales.