> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-agent-native-development.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Properties and Constraints

> Review CometChat Calls API properties and constraints for calling resources, request fields, limits, and supported values.

Properties and constraints for the Calls APIs.

## Calling

| **Property** | **Constraints** |
| - | - |
| Maximum users per call | 50 |
| Default video frame rate | 30 FPS |
| Video resolution | Min 180p, max 720p (varies by layout and user bandwidth) |
| Media encryption | SRTP |
| Audio codec | OPUS |
| Video codec | H.264 |


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