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feat: add pre call fetch configuration (#222)

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* feat: add pre call fetch configuration

* docs: add NEW tags for pages about new features

---------

Co-authored-by: Sabiha Khan <sabihak89@gmail.com>
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Abhishek 2026-04-06 12:30:37 +05:30 • committed by GitHub
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commit ec2f322486
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27 changed files with 646 additions and 66 deletions
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51
api/services/workflow/pipecat_engine_custom_tools.py
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@ -14,7 +14,6 @@ from typing import TYPE_CHECKING, Any, Dict, List, Optional
from loguru import logger
from api.constants import APP_ROOT_DIR
from api.db import db_client
from api.enums import ToolCategory, WorkflowRunMode
from api.services.telephony.call_transfer_manager import get_call_transfer_manager
@ -28,11 +27,10 @@ from api.services.workflow.tools.custom_tool import (
execute_http_tool,
tool_to_function_schema,
)
from api.utils.hold_audio import load_hold_audio
from api.utils.hold_audio import play_hold_audio_loop
from pipecat.adapters.schemas.function_schema import FunctionSchema
from pipecat.frames.frames import (
FunctionCallResultProperties,
OutputAudioRawFrame,
TTSSpeakFrame,
)
from pipecat.services.llm_service import FunctionCallParams
@ -539,7 +537,11 @@ class CustomToolManager:
# Start hold music as background task
hold_music_task = asyncio.create_task(
self.play_hold_music_loop(hold_music_stop_event, sample_rate)
play_hold_audio_loop(
self._engine.task,
hold_music_stop_event,
sample_rate,
)
)
# Wait for transfer completion using Redis pub/sub
@ -666,44 +668,3 @@ class CustomToolManager:
# Unknown action, treat as generic success
logger.warning(f"Unknown transfer action: {action}, treating as success")
await function_call_params.result_callback(result)
async def play_hold_music_loop(
self, stop_event: asyncio.Event, sample_rate: int = 8000
):
"""Play hold music in a loop until stop event is triggered.
Args:
stop_event: Event to stop the hold music loop
sample_rate: Sample rate for the hold music (default 8000Hz for Twilio)
"""
try:
# Path to hold music file based on sample rate
hold_music_file = (
APP_ROOT_DIR / "assets" / f"transfer_hold_ring_{sample_rate}.wav"
)
hold_audio_data = load_hold_audio(hold_music_file, sample_rate)
num_samples = len(hold_audio_data) // 2
duration = int(num_samples / sample_rate)
logger.info(f"Starting hold music loop with file: {hold_music_file}")
while not stop_event.is_set():
# Queue the hold audio frame
frame = OutputAudioRawFrame(
audio=hold_audio_data,
sample_rate=sample_rate,
num_channels=1,
)
await self._engine.task.queue_frame(frame)
# Wait for the audio to play or until stopped
try:
await asyncio.wait_for(stop_event.wait(), timeout=duration + 1.5)
break # Stop event was set
except asyncio.TimeoutError:
pass # Continue looping
logger.info("Hold music loop stopped")
except Exception as e:
logger.error(f"Error in hold music loop: {e}")