iter_call_participants

from telethon.tl.functions.phone import GetGroupParticipantsRequest
from telethon.tl.functions.channels import GetFullChannelRequest
from telethon.utils import get_peer_id

async def iter_call_participants(chat_id):
  call = (
    await client(GetFullChannelRequest(chat_id))
  ).full_chat.call
  offset = ""
  while True:
    r = await client(
      GetGroupParticipantsRequest(
        call=call,
        ids=[],
        sources=[],
        offset=offset,
        limit=20,
      )
    )
    if not r.next_offset: break
    offset = r.next_offset
    entities = {u.id: u for u in r.users + r.chats}
    for p in r.participants:
      p.entity = entities.get(get_peer_id(p.peer))
      yield p