Separate names with a comma.
Sorry, I know this seems simple but I do not have any experience with older version of 3CX (Windows).
I have been working mainly in the last year...
I am using 3cx v12.0.4xxx with a Patton 4114sn gateway.
Server: Win7 Pro, 4gb ram, i3-3240 CPU @ 3.4GHz, 500gb hdd.