On the 7 August 2010 the Thailand ham radio license authority approved the use of callsign E2E for all modes and on HF only.
E2E was the brainchild of Charly, HS0ZCW, who sought a short length callsign for contests and DXing in representing Thailand on an equal basis like other one by one callsigns of other nations. Mr. John, HS1CHB, took the proposal to the authorities and shepherded the paperword to success. The national club, the Radio Amateur Society of Thailand (RAST) is the call host. RAST’s main club call sign is HS0AC. RAST president and some members assisted.
E2E via HS0AC.