End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
http://mazrae-asia.farafile.ir/file/29165/پاورپوینت-ساختار-شبکه-های-دسترسی-fttx-در-مخابرات