The Transport and Retail Allied Workers Union (TRAWU) on Tuesday called for a secondary strike on April 17 at the major telecommunications groups, including Telkom, Vodacom, MTN, and Cell C, in support of a prolonged strike occurring at CJA Telecommunications. Silverton, Pretoria-based CJA Telecommunications, originally established as a close corporation in 2004 to service Telkom South Africa as a turnkey contractor, converted to a privately owned company in 2009. The company does infrastructure projects for nearly all of the major telcos in Southern Africa, including planning, civils, VSAT, LAN and fibre, greenfield installations, wifi, generators, batteries, base stations, and site build projects. A TRAWU spokesperson said that about 120 CJA staff nationwide had been on strike since April 2, and while the company was still operating, its operations were likely…