server protocol 71

I have recently bought quake III arena on GoG.com. After running some Games with bots I decicded tp try out multiplayer.

So I went to check out available servers on gametracker.com .
I spotted an active server named something like 'ctf for stupids' but when trying to connect to it I got 'server uses protocol 71 ( you use protocol 68'.

I know that mismatch in protocol version is usually caused by different running version of games. But after patching game to 1.32 ( what was also displayed by game console ), I got the same message. Even after installing and launching the game with OSP.

I tried another server - freeze tag deathmatch server or something like that. And xonnected without any issues.
So what do I need to use this protocol 71? Another mod? Can I check it anywhere what which 69+ protocol number means?