Feb 9 (Reuters) - CSG Ltd CSV.AX :
* REVISED FY2018 UNDERLYING EBITDA GUIDANCE TO BETWEEN $18.5 MILLION TO $21 MLN
* H1 UNDERLYING EBITDA ABOUT $4.6M
* H1 REVENUE $117 MILLION
* REVISES FY18 REVENUE GUIDANCE TO BETWEEN $253 MILLION - $260 MILLION