> For the complete documentation index, see [llms.txt](https://hotro.voip24h.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hotro.voip24h.vn/huong-dan-su-dung-telesales-dang-cap-nhat/gioi-thieu.md).

# Giới thiệu