Why am I receiving a 429 error?
A 429 Too Many Requests HTTP or SIP response indicates that your application has attempted to initiate more traffic than your current account provisioning allows. Like all cloud communications platforms, Vobiz imposes limits to protect carrier network integrity and ensure fair resource allocation.
You have hit one of two limits:
1. Concurrency Limits
Concurrency is the total number of simultaneous, active calls currently running on your account. If your limit is 10, and you attempt to dial the 11th call before any of the previous 10 hang up, the request will immediately fail with a 429.
Read more about Concurrency →2. CPS Limits
Calls Per Second (CPS) is the rate at which you launch new requests. Even if your concurrency limit is entirely free, if you have a CPS limit of 1 and rapidly blast 5 calls in the exact same second, the latter 4 calls will be rejected with a 429.
Read more about CPS →How to Resolve 429 Errors
To stop receiving 429 errors, you must either pace your outbound dialer to match your allowed limits, or purchase a higher operational ceiling.
- Check limits: Log in to your dashboard and navigate to the Account Settings limits to observe your current CPS/Concurrency ceiling.
- Implement pacing queues: Adjust your backend application logic (like RabbitMQ or Redis queues) to smoothly rate-limit the distribution of outbound API triggers.
- Purchase an Upgrade: You can effortlessly scale up to hundreds of concurrent channels by purchasing higher concurrency directly via the billing portal.