Telegram Messenger is an Instant Messenger App that syncs across all of your devices and can be used on desktops, tablets and phones alike. You can send an unlimited amount of messages, photos, videos and files of any type (.doc, .zip, .pdf, etc.). To block Telegram Messenger (1) Enable all Telegram Messenger application control signatures (IM Category); (2) Enable "Encrypted Key Exchange -- TCP Random Encryption(Skype,UltraSurf,Emule)" (SID 5) (PROXY-ACCESS); (3) Enable "Non-SSL traffic over SSL port -- Traffic Anomaly Detection" (SID 6) (PROXY-ACCESS).

This SonicWALL signature identifies legitimate Telegram Messenger network traffic.