SendSignalingData

import asyncio
from ferogram import Client, raw

app = Client("my_session", api_id=12345, api_hash="0123456789abcdef0123456789abcdef")

async def main():
    await app.start()
    result = await app.raw.phone.SendSignalingData(
        peer=raw.types.InputPhoneCall(id=0, access_hash=0),
        data=b'arbitrary\x7f data'
    )
    print(result)

asyncio.run(main())