The latest version of COD4 Frontlines released in 2009 before the R3L04D project as some people requested. This version doesn't have Airborne Support, lots of new gametypes and features but have the default COD4 weapons. I don't give support anymore to this version. The Russian Frontlines Community still use this version.
This version is the one used at the very active Russian server which it's always full for your pleasure.