Highlights of the blogpost:

• Telegram 7.0 is not yet available for iOS, as Apple failed to review the update in time for Telegram’s 7th birthday (Telegram could have just waited a bit more tbh)
• for clients supporting the latest API layer available (layer 118), calls and video calls will use the new WebRTC-based VoIP library instead of libtgvoip (which is still embedded in the apps because of backward compatibility)
• video calls are e2e encrypted, of course

Small curiosity: the 3^rd round of the voip contest ended on April 8^th. This day probably marked the beginning of the works on the new VoIP library by whoever they hired - even though some people were already working on it. Regardless, it took ridiculously little time to bring it to production on all the official apps. I guess they skipped QA entirely lol

Small curiosity #2: screen sharing is also planned and will be released within 2020

Bonus: for its 7^th birthday, Telegram tweeted this nice video with an overview of all its cool features (relevant though I give them a pass as it’s not trying to be some relatable twitter corp crap)