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

# Bolna AI Updates for April, 2025

> Explore the latest features, improvements, and API updates introduced in April 2025 for Bolna Voice AI agents.

<Update label="29th April, 2025">
  ## Call Frequency Limiting

  * Set a limit on the maximum number of inbound calls allowed from a unique phone number to a given destination number. Call frequency limiting helps prevent spam, abuse, or unintended repeated calls.
</Update>

<Update label="27th April, 2025">
  ## Improvements

  * All inbound and outbound calls to have a maximum limit of `25KB` for injecting context.
    * Learn more on [injecting context for inbound calls](/customizations/identify-incoming-callers) for inbound calls.
    * Learn more on [injecting context for outbound calls](/using-context) for outbound calls).
</Update>

<Update label="23th April, 2025">
  ## Inbound Whitelist Control

  * Configure inbound rules to allow calls only from specific whitelisted phone numbers. Inbound whitelist control ensures that only trusted callers can initiate conversations with your agents.
</Update>

<Update label="20th April, 2025">
  ## Improvements

  * Latency improvements for agents using [guardrails](/guardrails).
  * Tool information will now be available in the post call analysis like [extraction](/call-details) & summarization.
</Update>

<Update label="17th April, 2025">
  ## Deepgram Aura-2 TTS Support

  * Added support for [Deepgram's](/providers/voice/deepgram) Aura-2 TTS model `aura-2`.
</Update>

<Update label="16th April, 2025">
  ## Improvements

  * Transcripts will now be more [accurate by incorporating interruptions](/customizations/capturing-precise-transcripts).
</Update>

<Update label="15th April, 2025">
  ## OpenAI GPT-4.1 Model Support

  * Added support for OpenAI's **GPT-4.1** family of models: `gpt-4.1`, `gpt-4.1-mini` & `gpt-4.1-nano`.
</Update>

<Update label="11th April, 2025">
  ## Improvements

  * Ability to remove voices from your account
  * Audio recordings are now stored in `dual` (stereo) mode for both inbound & outbound calls.
</Update>


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