Rate limits
The below throughput limits apply to Voice and Messaging. These are account-level limits that count activity from all Projects within your Space. Contact Support to increase a Space's default limits, and contact Sales to increase Voice and Messaging throughput.
Rate limits and backlogs for Messaging and Voice are separate. For example, exceeding the Voice rate limit does not cause outbound messages to queue.
Voice
View pricing and contact Sales to increase calling throughput.
| Value | Default limit |
|---|---|
| Calls | 1 call per second (CPS) |
| Backlog | 10,000 queued calls |
Messaging
View pricing and contact Sales to increase messaging throughput for toll-free or short code numbers.
| Number type | Default limit |
|---|---|
| Toll-free | 3 messages per second (MPS) |
| US long code (10DLC) | 4 MPS Actual throughput may be lower or higher depending on carrier and TCR limits |
| Canadian long code | 1 MPS |
| Short code | 10 MPS |
| Backlog | 10,000 queued messages |
Larger messages are automatically split into smaller "segments" which are sent as individual messages. Each of these segments counts towards the messages per second (MPS) limit. Consult the guide to Messaging Character Limits for more information.
API
The below limits apply to all API requests across the SignalWire platform. Every HTTP request includes the user's current limit and remaining requests in its X-Header.
| HTTP verb | Limit |
|---|---|
| GET DELETE | Effectively unlimited |
| POST PUT PATCH | 13800 requests per 10 seconds |
Queue and backlog system
When an application sends calls or messages to SignalWire at a rate exceeding the applicable rate limit,
SignalWire queues these messages or calls in the order received.
The backlog is the limit to the number of queued (pending) calls or messages.
The Voice backlog and Messaging backlog are both 10,000 by default.
When the backlog for calls is full, SignalWire will stop adding additional calls to the Voice queue. Similarly, when the backlog for messages is full, SignalWire will stop adding to the Messaging queue. The platform will process queued calls or messages at the maximum applicable rate, and add new calls or messages to the queue as long as the backlog has not been reached.
The Voice and Messaging backlogs are entirely separate.
If you would like to raise your Voice or Messaging backlog, request an increase to your Space limits.