### Answer
I don't have information about internal thread limits in Retell AI based on the available sources. The documentation provided doesn't specify maximum limits for internal threading or concurrent processing within the platform.
If you're looking for concurrency limits for calls, the default concurrency limit has been increased to 20 concurrent calls, and there's an API available to check your current concurrency and limit [(1) ](
) .
For specific information about internal thread limits or other technical constraints, I recommend:
- Checking the [Documentation](
)
- Visiting [Hire certified Retell partner](
)
Would you like a general answer based on my knowledge instead?