from nextcord import IntegrationType, Intents, Interaction, InteractionContextType, Message, utils
from nextcord.ext.commands import Bot

bot = Bot(intents=Intents(guilds=True, message_content=True, messages=True, members=True))

@bot.message_command(contexts=[InteractionContextType.bot_dm, InteractionContextType.private_channel], integration_types=[IntegrationType.user_install])
async def call_info(inter: Interaction, message: Message):
    assert message.call is not None
    assert message.call.ended_timestamp is not None

    return await inter.send(f"u: {','.join([p.display_name for p in message.call.participants])}\nts: {utils.format_dt(message.call.ended_timestamp)}")


bot.run(...)