Voice commands are configured using the voicecmds.cfg file. You may include this file with the server in the rocmod folder, or you can put it in a pk3 file along with any new sound files you have added to it.

The cfg file is only used by the server, however all clients will need to download any of the new sounds that are not already a part of the game. The ROC media pack is a good example to follow for creating your own sound pk3 file. A default cfg file is left on the server, and an updated cfg file using the new sounds is included in the pk3 file along with the sounds. That way, if the sound pk3 file is present, it will be used, otherwise the default will be used, and there will be no "missing sound" errors.

The following options may be used in the cfg file:
CMD# sound "path of sound file"
CMD# text "Text to display"
CMD# notext "display note"
CMD# sysoponly
CMD# adminonly
CMD# refereeonly
CMD# clanonly

For example, the following lines would create the @52 voice command:
52 sound "sound/npc/col8/washington/takingnames.mp3"
52 text "Kickin' ass and takin' names!"

In addition to the numbered voice commands, there is also a set of internal voice commands used by the mod itself, for things such as headshots, killing sprees, etc. These internal voice commands start with a single letter rather than a number, so there is no conflict with existing voice commands.

Note that many of the internal voice commands are sound-only. Any text you define for them will be ignored. Here is a list of the currently defined internal voice commands letters which you may use in your voicecmds.cfg file:

a = Headshot
b = Killing spree - Spree (sound only)
c = Killing spree - Rampage (sound only)
d = Killing spree - Dominating (sound only)
e = Killing spree - Unstoppable (sound only)
f = Killing spree - Godlike (sound only)
g = Killing Spree - Cheating (sound only)
h = Last player on team (INF/ELIM) (sound only)
i = First blood (sound only)
j = Weapon shot out of hand
k = Humiliation melee kill
l = 5 minute warning
m = 3 minute warning
n = 1 minute warning
o = Sudden death warning
p = End of killing spree (sound only)
q = New vote started (sound only)
r = Vote passed (sound only)
s = Vote failed (sound only)

are the standard voice commands that come with the mod. Editing the standard voice commands is not recommended, as it could confuse existing players who have their binds set.

@1 "Affirmative!"
@2 "Negative!"
@3 "Yes, sir?"
@4 "Yes sir"
@5 "Yes sir!"
@6 "Yes sir!"
@7 "Yes sir!"
@8 "Yeah!"
@9 "Yeah!"
@10 "lol"
@11 "lol!"
@12 "Hello"
@13 "Good day"
@14 "Good day, sir"
@15 "Help!"
@16 "Nice shot!"
@17 "Nice shot!"
@18 "Nice shot!"
@19 "Ha! Great shot!"
@20 "Dammit!"
@21 "Damn!"
@22 "I'll be right back"
@23 "Thank you"
@24 "Yeah, thanks"
@25 "Thanks"
@26 "Incoming!"
@27 "Advance!"
@28 "Advance!"
@29 "Awaiting orders!"
@30 "Hold position!"
@31 "Lets go! Move!"
@32 "Go check that out"
@33 "Go check that out!"
@34 "Move it!"
@35 "Fan out!"
@36 "Pair up!"
@37 "Spread out!"
@38 "Clear!"
@39 "Cover me!"
@40 "Got him!"
@41 "Got it!"
@42 "Be careful!"
@43 "Watch out!"
@44 "Get down!"
@45 "Get down!"
@46 "Take cover!"
@47 "Under fire!"
@48 "I'm hit!"
@49 "Man down!"
@50 "Secure the perimeter!"
@51 "I need backup, NOW!"
@52 "Objective complete!"
@53 "Hey honey"
@54 "Coming through"
@55 "Don't hurt me!"
@56 "Excuse me?"

And many more can be custom made for each server. Type in /sounds in the console for a complete list on each server.