Telegram to SIP Asterisk gateway

Create a service like https://www.sip.tg/en/docs-gateway/ option to use their open source project https://github.com/Infactum/tg2sip so that our clients can call our asterisk PBX from their telegram accounts.

Here you can see how the bot works https://t.me/siptg_bot?start

https://www.indiegogo.com/projects/telegram-to-sip-voice-gateway--2#/

Libraries used:

https://github.com/grishka/libtgvoip
https://github.com/tdlib/td
http://www.pjsip.org/
Supported call types are:

SIP->TG call by username
SIP->TG call by phone number (if callee is registered in telegram)
TG->SIP to fixed SIP URI (can be set up in TG2SIP settings).
Current TG2SIP version can handle about 100 simultaneous active calls with opus@48k codec on ordinary hardware.

If the library works fine, it shouldn't take big amount of time if the person is competent in the area.