> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sayvyai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Limits & Quotas

> System limits, payload constraints, and concurrency quotas across Sayvy AI

# Limits and Quotas

To ensure ultra-low latency (sub-500ms voice turn-around) and protect against infrastructure denial-of-service, Sayvy AI applies the following payload, concurrency, and operational limits.

***

## Concurrency Quotas

| Metric                          | Free Tier | Growth Tier | Enterprise Tier  |
| :------------------------------ | :-------- | :---------- | :--------------- |
| **Simultaneous Outbound Calls** | 2         | 25          | Up to 1,000+     |
| **Simultaneous Inbound Trunks** | 2         | 50          | Dedicated Trunks |
| **Active Campaign Batches**     | 1         | 10          | Unlimited        |
| **Simultaneous WebRTC Rooms**   | 5         | 100         | Unlimited        |

<Info>
  Simultaneous call limits are evaluated across your entire workspace in real-time. If a dispatch exceeds your concurrency cap, the API returns a `429 concurrency_limit_reached` error.
</Info>

***

## Payload Size Limits

| Resource                                     | Maximum Limit      | Notes                                               |
| :------------------------------------------- | :----------------- | :-------------------------------------------------- |
| **JSON Request Body**                        | 10 MB              | Applies to all REST endpoints.                      |
| **Voice Agent System Prompt**                | 32,000 characters  | Maximum tokens depend on underlying LLM model.      |
| **Custom Function / Tool Declarations**      | 64 tools per agent | Evaluated during conversation turn.                 |
| **Audio Upload Size (Recordings / Samples)** | 50 MB              | Supported formats: `.wav`, `.mp3`, `.ogg`, `.flac`. |
| **Batch Campaign Contacts**                  | 10,000 per request | Use pagination or CSV upload for larger cohorts.    |

***

## Operational Timeouts

| Operation                    | Timeout     | Action on Timeout                                                         |
| :--------------------------- | :---------- | :------------------------------------------------------------------------ |
| **REST API Gateway**         | 30 seconds  | Returns `504 Gateway Timeout`.                                            |
| **Voice Call Max Duration**  | 2 hours     | Automatically ends call session and triggers webhook.                     |
| **Silence / Idle Timeout**   | 120 seconds | Call terminated if recipient remains silent after 3 agent prompts.        |
| **Webhook Delivery Attempt** | 10 seconds  | Retried 5 times with exponential backoff before being marked dead-letter. |

***

## Requesting Limit Increases

Enterprise customers can request increased concurrency quotas, custom TTS model instances, and private SIP trunking:

1. Visit the **Billing & Plan** tab in your Sayvy AI Console.
2. Click **Request Quota Increase** or reach out directly to your account manager at [support@sayvy.ai](mailto:support@sayvy.ai).